Category Archives: Keweenaw Peninsula

Great Lakes Gemstones-Our Core Products

Isle Royale Greenstones, Thomsonite, Datolite, Lake Superior Agates, Petoskey Stones, Pudding Stones, Kona Dolomite, Copper Agates, and Silver/Copper Nuggets (aka Half-breeds), have always been the base for our business.

The popularity of Thomsonte has been on the upswing. Most of the goos Thomsonte comes from secret spots on the North Shore of Lake Superior. There’s something about this beautiful, pastel pink, Zeolite, that people love.

Our main products consist of Great Lakes Rocks & Minerals. Some of these core stones have been found by us, Others were purchased from collectors in the Great Lakes Region. I will publish this blog in two parts. I have loads of pictures to show you and will share images of some of our most popular jewelry gemstones. The second part will be jewelry made from those Great Lakes gemstones.

Michigan’s Official State Gemstone may be out most popular, and most rare of anything we sell. Greenstones are found nowhere else in the world; only on Isle Royale and on the old spoil piles of some of the copper mines in the Keweenaw Peninsula.

Copper Agates are found in some of the mine spoil piles in the Keargarge Lode. They are very coveted, and hard to find.

Our customers search our Snobappealjewelry.com or ETSY site for jewelry made from all these Michigan Gemstones.

Our pride in Michigan, and the Gemstones found there, reflects in our jewelry. We have many happy customers, that return again and again to purchase more pieces of jewelry to add to their collections, or to give as treasured gifts.

Unakite (top) is a Granite comprised of Pink Feldspar, Epidote, and Quartz. It is commonly found on the Lake Superior Beaches. I personally think it makes wonderful jewelry.
On the bottom is Mohawkite from several Mines near Mohawk, Michigan. Some people love it, but we that cut it, must be careful because of the Arsenides in it. It is safe to wear, as we seal it with a two part industrial epoxy.

Datolite is another Copper-associated rock. Where you see Datolite, there is usually copper in the neighborhood. Copper often permeates into the Datolite, causing the Datolite to have a pink tinge. Sometimes you can see the Copper in the stone, as you do here. The above Datolite also contains Green Epidote.

Orders come from all over the country. We wonder and are often awestruck at how people, in Utah or California for example, know about Isle Royale Greenstones or Copper Agates. Sometimes we have the chance to ask them where they heard of Petoskey Stones or Datolite, and more often than not, they have some connection to Michigan. They may have hunted the rockpiles in the Keweenaw, or the beaches of Lake Michigan. Their family has roots in Michigan, or they attended Michigan Tech in Houghton (Go Huskies!). At times they may have found a piece of jewelry at Copper World in Calumet, or bought something from us at an art show in Eagle Harbor or Copper Harbor. Customers can have Nostalgic memories of hunting the beaches with their families in the U.P. for rock treasures.

Sure evidence that Greenstones and copper can be found together in many copper mines. This little gem is a lucky strike for sure, a rare find!

Nostalgia often is associated with the custom jewelry pieces we make. People send stones they have found, saying things like “I’ve been looking for someone, for years, that can make a piece of jewelry from a Laker (or other rock) that I found while with my Grandpa decades ago on the shores of the Lake Superior or Lake Michigan”. “YES; I can do this for you; What did you have in mind”?

Copper Firebrick was formed when the bricks used for construction of Copper smelters, got permiated with Copper Vapors and molten Copper.
The Datolite was a lucky cut, with an interior in the form of the Lower Peninsula.

This blog includes, but not limited to, rocks and minerals we most often make jewelry from. Since we live in Michigan we specialize in Michigan State Stone (Petoskey Stone) and Michigan State Gem (Greenstone).

Petoskey Stone is Michigan’s Official State Stone. We make many things from this, and other Devonian Fossils. Cladapora is the other fossil seen in this picture.

Our website contains well over a thousand unique pieces of jewelry. We’re proud to individually make each piece. We do not have cheap “Buy-sell” things made in foreign countries. We are a locally owned Michigan small business, proudly sharing our handcrafted Great Lakes stone jewelry with people across the country.

Have fun looking at our core Great Lakes treasures. If you see something you like, call or E-mail us. If you have an idea for a custom wire wrap, or beaded treasure, get ahold of us.

Rock Hunting in the Upper Peninsula

Richard and Andrew Marek had great father and son bonding time on the piles.

We usually travel to Michigan’s Keweenaw Peninsula, in August, where we participate in Art Shows, and do wire wrapping demonstrations at Copper World in Calumet. Because our art shows were cancelled and demos were not possible due to the Virus, we focused on rock hunting in the Upper Peninsula.

The Ranger is the National Park Service boat that serviced Isle Royale National Park. From our campsite, we watched it go out every two days.

We camped and rock hunted to our hearts’ content. While camped, I was able to work on the rocks we found with my mobile shop setup and made jewelry on my work bench.

A classic Candy Striper always make me smile. This one, I purchased from Ryan Pikk at the Quincy Swap Meet. I took the rough Laker back to the RV, and made it into instant jewelry.

This Amethyst Laker called me to make it into jewelry while in the Keweenaw.

Keweenaw Prehnite is absolutely gorgeous.

The Isle Royale Queen IV is not running from Copper Harbor this year. The only way you can get there is by seaplane.The

There are still a few inches to squeeze in more rocks.

The pile here used to be above the trees. I am carefully searching for an elusive Greenstone, with only moderate success.

Bonnie searches a beach at dusk. Is she looking for a fluorescent rock?

Was rock hunting successful? Yes, considering the good areas becoming more scarce. Most of you know that many of the old rock piles have been crushed and hauled away, leaving large flat area and small piles. Where rock piles used to be as high as the trees, they’ve now ground level. You have to work harder to find what used to be relatively easy.

A drill core is a treat to find. Just thinking a trio of miners, 100 years ago , could have drilled this hole.

Bonnie’s goal was to find the worlds’ largest Greenstone, which was not happening, while mine was to survive the rock piles while still recovering from and ankle fusion. I accomplished my goal, and was stronger at the end of our trip. It’s amazing to me that you do not feel much pain when you are actually rock hunting, but it catches up after the hunt is finished for the day.

We hunted close to a dozen locations, with limited success in every locale. We stocked up on rocks and minerals we could use in our grab bags, that we sell 3 for $10 at art shows and elsewhere. Some things everyone loves in their grab bags are, small Greenstones in matrix, shiney Calcite, Prehnite, and small copper pieces.

A Garden Rock of Great Size

Other things Bonnie looks for are new garden rocks. You should have seen us hauling a 70# chunk of mine rock with calcite and Cuprite seams. That one was hard to miss in the pouring rain.

This is the colorful garden rock we hauled off the Central Pile.

I see Prehnite, Calcite, and specks of Copper.

It was quite a trek to the car, and we tried, with limited success to fit this rock into a 5 gallon bucket on our Broll (Bucket Roller). Bonnie steadied the rock, while I pulled the cart to the car. We only dumped it a couple times; each time stopping, and hoisting it back into the stretched bucket. It’s amazing what greed will make a person do.

Hunting with Friends

Our new rockhound buddy Rayanne around the best of the day.

In the great out doors it seemed safe to rock hunt with others. We took some friends from our rock club around to some places for them to hunt. I can testify they too were greedy, filling up the back end of their pickup. We all had great fun, and tested our mettle in the rain.

We found some fine gem grade Prehnite, a few fine Copper Crystals, a limited supply of possible Greenstones, and a couple small Datolites.

The Swap meet at the Quincy Mine produced several Copper Agates, a couple fine Candy Striped Lakers, and much visiting with old friends at an Unsociable Distance.

Lots of these Chlorite-coated balls about. Gotta cut this one and see. It looks promising

The one that looked promising above, turned out to be the best we found.

This is often the case with Greenstones. You see some pattern, but it runs out.

Of course we also made a visit to the A. E. Seaman Mineral Museum on the campus of Michigan Tech, to see all the specimens from the area that we drool over. The great colored Datolites (and huge too) are big favorites.

Centennial Datolite is one of the rarest.

All the campgrounds were totally filled, and continue to be, so if you go rock hung in the UP or Keweenaw, get reservations.

Fantastic sunsets. This one from the top of Brockway Mountain.

This year was a more restful visit than usual, but we still missed the Art Shows.

Greenstones on the Bench-Awesome Isle Royale Greenstone

If you have followed my blogs over the years, you should have noticed many are about Isle Royale Greestones. I am amazed by orders from all over the country for cabochons, pendants, and earrings. How do these people know about these rare, one-source gemstones?

Many people have visited Isle Royale National Park, and know these stones can be found on the Island, but park regulations do not allow collecting Greenstone, as well as other specifically listed rocks and minerals. Having said this, the National Park Service policies have changed over the years in regards to picking up Greenstone. Isle Royale Greenstone have actually been protected since isle Royale National Park was estabished in April of 1940. There are individuals, even today, that harvest a few Greenstones while visiting Isle Royale. I guess my personal feeling is neutral on this subject, but they could pay a price if caught.

The Park service looked the other way, back in the day, when visitors picked up a few Greenstones on the beaches. Tiny little Greenstone, although fairly tough, were eventually ground up by the mighty Lake Superior, so why not let a few go home as mementos. The problem came with commercial Greenstone expeditions, where thousands of Greenstone were harvested by divers or “professional pickers”, and sold on the mainland for massive profit. The park service cracked down on these greedy private business collectors, and began enforcing the collecting rules that were always on the books. Today, there is a strict and enforced policy against removal of certain Gemstones and Copper from Isle Royale.

Over the years, I often have conversations with customers about old rock collections from decades ago. The collections are sometimes discovered by heirs in basements, garages, or sheds. My ears perk up at the sound of “grandpa’s old rocks”. Last year I bought an old Greenstone collection that was stored in a barn for fifty years, the rockhound that collected them was remembered by the jewelry he made, but some stones remained.

I am an obcessed person when it comes to cutting and polishing Greenstone. I try to limit myself to 100-150 of them for marathon cutting and polishing (I can oly average 4 Greenstones an hour). I’ll select the beach tumbled stones from my stash, throw them in my redneck bowl (CoolWhip), and take them to my shop to flatten the backs for Dopping. FYI; the rough Copper-Greenstone, featured in the opening blog photo, is at 12 O’clock in the bowl. I thought it was just a Thomsonite-included stone. There was no indication it had Copper in it until it was cut (with me smiling).

After the backs are flattened, I push them, flat side up, into that crispy Styrofoam used for making wreaths. Sometimes I get lucky, and am able to get broken scraps.

Finishing Isle Royale Greenstones

Whenever the urge presents itself, or my inventory depletes, I decide to have a Greenstone production week. Production usually involves sorting out stones for both pendants and earrings. Earrings are generally sorted for color, size, and quality AFTER the Stones have been dopped, cut and polished, and removed from the dopsticks.

Depending on the size, pendant stones may or may not need to be dopped. Dopping involves gluing or hot waxing a stone to a wooden stick, a nail or a screw, to allow safe cutting without the skin touching the diamond imbedded wheels of the Lapidary Machine. Some bleeding is often present even though the stones are Dopped. I tell Bonnie, that a little blood on the stone improves the polish (NOT). I do heal fast. Some of my cutting and polishing of Greenstone methods I keep under wraps, but standard methods work well for most. I may continue, starting with how I remove the stones from the Dopsticks, and proceed from there.

A tiny Greenstone, from the Jeremy Graham collection, I recently wire wrapped for him. An unusual yellowish-green Island stone with Thomsonite inclusions.. Many times good things come in small packages.

Greenstone Quality

Island Stones are usually superior to Keweenaw stones in all respects. They generally harder and the pattern goes completely through the stone. The pattern most often, is a finer pattern, and often the color is a pale sage green. Because of the hardness of the Island material, Isle Royale Greenstone take a super deluxe polish. You can read more about the colors and inclusions in Greenstone in the Snob Blog article, The Shades and Patterns of Greenstone (Chlorastrolite).

Island Stones make wonderful stud earrings due to the fine pattern that is usually present. Isle Royale stones cost a little more money, but are lovely.

Another phenomena of Island stones is their color variations; some are so unusual you can have doubts that they are actually Chlorastrolite.

We invite you to have a closer look at our Greenstone–check out our wide selection of cabochons, pendants, and earrings.

Patricianite (or not!)

Apple Green Prehnite appears as vein material in some mine spoil piles from Calumet north. Normally it has fine Native Copper inclusions. This is some of the “Chunky” variety of Prehnite mixes. Notice that this material forms in veins, as does Patricianite, in most cases.

Before I can address how to identify Patricianite, I have to address the main ingredient–Prehnite. Prehnite occurs generally in vein material in many of the mine waste piles in the central Keweenaw Peninsula area from Calumet north to Copper Harbor. Prehnite is formed in veins and cavities in Keweenaw basalts, and is associated with other Keweenaw Minerals, including Calcite, Datolite, Chlorastrolite (Greenstone), Quartz, and Zeolites. It is also closely associated with Native Copper.

Typical Prehnite Mixes and Patricianite Beach Pebbles. These pebbles often have Copper inclusions and beautiful radiating eyes, similar to Thomsonite, hence the local name of U.P.Thomsonite is commonly mentioned.

Patricianite and Prehnite, from the Keweenaw Peninsula, come in both smooth or chunky, just like peanut butter. Smooth beach pebbles of White, Pink, and Green are not uncommon finds in the Keweenaw, The pastel colors often appear stirred together. Chunky Prehnite or Patricianite are found in the mine spoil piles, roads, or secret holes near Thomsonite Hill. The forest roads sometimes produce nice Prehnite mixes. Here’s a secret; some of the Prehnites appear white, and is often passed over on these forest roads. The colors and patterns are hidden under this thin rind and are not visable until this rind is removed.

Patricianite is a special variety of Prehnite, named by Rosendahl, in 1966, after his daughter Patricia Ann. Green Prehnite with inclusions is not considered Patricianite. In order to have Patricianite, you must three ingredients: 1. Pink Prehnite; 2. Chlorite; and 3. Visable Copper Inclusions. If any of these three elements are not visable, you do not have patricianite. (pink prehnite is light apple green prehnite containing microscopic specks of copper that have changed the green Prehnite to pink shades). The more Copper in the mix, the darker pink; I have found a few Prehnite pieces that are actually Maroon from so much Copper. If you hold these pieces in the sunlight the massive ammount of micro-copper is very evident.

I usually like to write a new blog and have it published close to the first of the month. I wanted to write about Patricianite, but I could not find a good piece anywhere. If you have so many rocks, you can’t find A rock, perhaps you have too many rocks; NOT! While searching for a nice piece of Patricianite, lo and behold, I discovered some amazing Datolite. Now I’ve become distracted by the Datolite I forgot I had. While looking through the old Datolite, I found a small slab of PATRICIANITE. At a glance, Patricianite can look like Datolite, that’s why it was there. So amazing things lost years ago (can something be lost, it you don’t know it’s lost?), were found today. Now, even though Greenstone is being worked in the shop, the Datolite is calling.

The pebbles of Prehnite found on the beaches, are generally a combination of beautiful apple green, pink, white, and other colors which appear stored together (smooth), while the mine spoil piles produce chunky seam Prehnite. Usually the seams aren’t much more then an inch wide, and if you are lucky, you can find gem green Prehnite visibly peppered with copper. Prehnite in these seams seems to form from both sides of the seams, and either meets in the middle of the seam, or there may be a gap right down the middle of the seam. Bubbly, boitrioidal, Prehnite is also found on the spoil piles. This Prehnite is translucent and has a vitreous luster. If you find one of these, you have a great specimen.

There was so much Copper in this Prehnite that the stone was Maroon. Patricianite?; Some call this Patricianite, but not the classic mix.

Prehnite with copper and Chlorite. No Pink, so this isnot Patricianite.

A beautiful pink and white Prehnite cab, but no evidence of Chlorite. Copper IS in there, but I can see no Chlorite.

A close-up of the previous cab, reveals visible Copper, but I see no Chlorite. I believe this is Patricianite, but I would not argue the point. That Chlorite has to be in there, doesn’t it? Under magnification that triangle in there looks loke a Pseudomorph of Aragonite, doesn’t it?

Copper and Patricianite mix, but green so Not Patricianite.

This is Patricianite; all the right ingredients and more.

Prehnite in the Keweenaw is sometimes referred to as UP Thomsonite. People used to think Prehnite was a form of Thomsonite until testing by Michigan Tech proved that it was not. Prehnite can have eyes, and radiating crystals similar to Thomsonite, but Prehnite is not a Zeolite, as is Thomsonite. TRIVIA: Prehnite is the first modern mineral named after a person. You can read about this on one of my previous blogs. https://www.snobappealjewelry.com/blog/can-you-make-jewelry-from-keweenaw-prehnite/

Prehnite is a favorite stone to make Keweenaw Stone Jewelry from, the shiny copper bits and pink and green color variations make it interesting and popular. High quality, gemmy Patricianite and Prehnite are highly prized for jewelry and collecting. Visit our Prehnite Jewelry page.

See other jewelry from Keweenaw rocks and minerals: Greenstone, Datolite, Firebrick, Mohawkite, Thomsonite, Lake Superior Agates.

Just as an aside; In order to do the research for this article I happily dug into my collection of old Rock & Mineral books. Every time I do this, I pick up little known and forgotten facts. I was reading “Rocks and Mineral of Michigan” published by the State of Michigan Department of Conservation (now the Department of Natural Resources; DNR) in 1939. It was so old it referred to MSU as Michigan State College, and MTU as Michigan College of Mining and Technology. I’ve got to re-read this book and perhaps find a new rock hunting area lost in the past.

Swing into 2019 with Great Lakes Stone Jewelry

“Greenstone, Copper Agates, Lake Superior Agates, Datolites, and Pink and normal Petoskey Stone Jewelry continued to be popular in 2018; and we expect this trend to continue. Our loyal customers understand how rare these Gemstones are becoming, and eagerly order them as impressive and historic pieces of jewelry from the Great Lakes Region. Many are buying these rare Gemstones as investments and treasured heirlooms. Great Lakes jewelry makes unique and highly appreciated gifts.Thanks to all of you that bought handmade in the USA, Great Lakes jewelry treasures, in 2018.

Christmas is past, but many of you are now wearing our jewelry. Thank you so much.

Bonnie’s Christmas Pendant: Top to Bottom; Lake Superior Agate, Yellow Keweenaw Point Datolite with Copper, Greenstone with Thomsonite from Isle Royale (Collected at least 50 years ago).

What does the jewelry makers wife get for Christmas? The trick is to make her something special (and make it in a stealth mode). I think I pulled a good one off.

I picked out three special stones; cabbed them, and made a beautiful Lake Superior Area Showpiece. The top stone is a wonderful, flawless Laker. Stone two is an ultra rare Keweenaw Point Yellow Datolite with Copper. The third Stone a very finely colored Isle Royale Greenstone that I retrieved from my very old collection of Isle Royale Stones. All these stones swing freely and separately from each other.

Bonnie: “You’ve got wires going everywhere!!” Me: “Don’t worry, I’ve done this before.”

I took care of all those errant wires; (see above picture) which proved me worthy.

Very unusual pattern and coloration from the Central Exploration Mine. Enhanced with a nice pair of Greenstone beads. 2.8 Gram Greenstone about Quarter-sized large Greenstone.

A double Greenstone pendant with a free-swinging bottom. Phoenix Mine.

I’ve decided to up my game in 2019 by making some exceptionally notable pendants. Thanks all, and a very Happy New Year to you all.

Visit our best-selling Great Lakes Stone jewelry pages: Lake Superior Agate Pendants, Petoskey Stone Pendants, Thomsonite Pendants, Michigan Greenstone Jewelry, Mohawkite Pendants, Datolite Pendants, Firebrick Pendants, Prehnite Pendants, Copper Replacement Agate Pendants. Also we have beaded earrings: Jasperlite, Leland Blue Stone, and Lake superior Agate and Kona Dolomite. We also have Unakite, Binghamite, Kona Dolomite pendants in our show inventory. What’s your favorite Great Lakes jewelry stone? Chat with us on Facebook, or send us a message!

Brockway Mountain Agate Treasures

View from the Copper Harbor Lookout on Brockway Mountain Drive. Mid 1930’s

History is not really my favorite subject, I am more of a rock guy. I will tell you about hunting for Brockway Mountain agates, but first I will show you some historic pictures of the area.

I married into a family of historians. Bonnie’s parents collected many things, including postcards from 1930 through 1960. While she was looking through their old cards she discovered several that depict the Keweenaw when it looked a bit different. Some pictures from 1935 of Brockway Mountain were especially interesting, considering what it looks like 80 years later. I enjoyed looking back and comparing it with the area as it is today.

View from the Copper Harbor Lookout today. Really it is surprisingly similar to the earlier pictures. How many other areas as beautiful as this are not cluttered with huge mansions and gated communities or condos?

From the 1950’s, This sign welcomed people to the Keweenaw. The “Copper Country Vacationist League’ was the forrunner to the Keweenaw Convention & Visitors Bureau.

Mid 1930’s. The trees are bigger today. You can see the top of Brockway Mountain in the distance.

From the mid-1930s, shortly after Brockway Mountain Drive was completed, you could see Lake Fanny Hooe on the right and Copper Harbor on the left. The trees frame this view today.

Thanks to the persistence of many folks, the mountain was saved from private development and access was retained for the public. What a loss that would have been!

Making jewelry on the mountain top while waiting for the sunset.

I made this Firebrick Beauty on the mountain

The sunsets from the top of Brockway Mountain have to be some of the most spectacular sunsets on earth.

I shared my secret hole with a couple of my best rockhounding buddies. Chris Cooper and I.

You finding anything in that hole Gary (Gary Katt)?

Looking for agate seams

During the constuction of Brockway Mountain Drive, many large egg-shaped agates were found. The inside of these were pretty much colorless Quartz. Very few had any banding except near the crust. I had one in my collection, did not know what it was, cut it and found the Quartz. In recent years I did some digging in the hard rock, opened a hole that has been very productive. You can see this in the videos.

Close up of an agate seam in matrix

A nice nodule collected

Don’t these Keweenaw agates look nice when they are washed?

State law limits collecting to 25 pounds per year now. When this was collected no limit was in place.

THE FOLLOWING MOVIES ARE REAL; AS THEY HAPPENED; WITH NO CAMERA TRICKS OR EDITING. ENJOY!! I just thought they’d be more exciting with disclaimers.

Today, further down the Mountain, some nice Seam Agate can be found. This agate is referred to as Keweenaw Agate, Ledge Agate, or Brockway Mountain Agate. This Lake Superior Agate is often opaque and peachy colored, but some have nice banding. Many diggers, including me, have secret glory holes on Brockway. I have told a few rockhounds I trust to keep a secret and hope they find good Brockway Mountain Agates.

A prime example of Keweenaw Agate, also called Ledge Agate.

Opaque Ledge Agate from Brockway Mountain.

As you can see from my pictures and videos I love the Keweenaw and the gemstones that come from that area. If you like these stones, I invite you to purchase our pendants either as gifts or for yourself. They are great reminders of Brockway Mountain, Copper Harbor, Eagle Harbor, and other copper mining areas. Visit our selections of Lake Superior Agate jewelry, Michigan and Isle Royale Greenstone jewelry, Firebrick, Mohawkite, Prehnite, Datolite, Thomsonite today.

Isle Royale Greenstone Jewelry Bonanza

I use whatever I have to make dop sticks, screws, nails, etc. I had perhaps 100 Greenstones dopped in this bunch, ready to be cut and polished.

A Big, Bold, Greenstone about Quarter sized. Greenstone of this size are becoming extremely scarce. Many of the mine waste piles, where Greenstones were once found, have been crushed and hauled away for road fill.

Sometimes I wonder why certain things randomly happen. Why would someone decide they were going to sell grandpa’s rock collection, and pick me over the many thousands of rockhounds or jewelry makers?

A beautiful small Isle Royale Greenstone.

A non-island stone (this one from Central X)

On occasion I purchase Greenstones from other collectors. This is our Michigan State Gem, and collecting it is a challenge.The problem with Isle Royale Greenstone is that collection in the National Park is now illegal. My policy is to only purchase stones with provenance documenting that they were collected many years ago. These stones can only be found in old collections. The opportunity to purchase these historic stones presents itself on very rare occasions. A couple Greenstone collections have been acquired recently. Some from old mine waste piles and some from a very old Isle Royale collection.

Participating in Keweenaw peninsula Arts & Crafts shows allows us to meet many people. It is not uncommon when we are selling our Isle Royale Greenstone jewelry at arts & crafts shows for some random person to mention that Grandpa used to collect rocks and/or make jewelry. My response to these statements is always to query what happened to all of Grandpa’s rocks? Responses vary, but the ones I like are a derivative of Oh they are in my garage, basement, collecting dust, or some other relative has them. Most often we hear that they are lost or were sold off many years ago.

At a recent Art Show I returned to our booth and Bonnie was taking to a lady. Bonnie has a much more friendly face than I, and people seem to connect with her. I overheard the word Greenstone, but we generally do not interrupt conversations. An old Greenstone collection had been in storage for over 20 years! A worker on the island had spent free time walking the beaches and trails and collecting. This treasure we certainly were interested in looking at. The question of why people might chose us over someone else, to sell an old collection to, is obviously the awesome Bonnie’s friendly disposition and “good looks”; This statement should score me some points….

A couple days later I excitedly watched as an old wooden box was opened up to expose ten pounds of wonderful, but small, Isle Royale Greenstones! How long would it take me to find so many Greenstones in this day and age? It just can’t be done.

After a few days these Greenstones ended up changing hands. Bonnie thought I was crazy, but knew I was happy to have new stones to sort, dop, cut, polish, and wire wrap into Isle Royale Greenstone jewelry.

On the Keweenaw Peninsula, mine waste piles are being crushed and used for road fill; accelerated, recently, due to the storm damage to roads in the some areas. Historic Greenstone sources are gone forever. How long would it take you to dig ten pounds of Keweenaw Greenstones? Where could you even locate this many Island Stones? I have found many Greenstones in the past, but it is not like the old days folks.

Beautifully patterned Island Stone.

A Thomsonite-flowered Greenstone from Isle Royale.

Some prefer a smaller pattern. This chatoyant beauty is from Isle Royale.

A very cool bubbly Island Greenstone desert with a whipped Zeolite topping.

An amazing light Green, broad patterned, Island stone is small, but very worthy.

I have been happily cutting this hoard; the shop machine have been humming, and I have been smiling. These beautiful Greenstones were actually within a few miles of us every time we went to the Keweenaw, but just like magic, they eventually migrated to me. I think it was Kharma, or it could have been just plain luck resulting in Isle Royale Greenstone jewelry!

During November and December, many of these spectacular stones will appear in some new jewelry and sold on our website in the Greenstone area. If you need a perfect Greenstone, like what you see in this blog, get ahold of us. Christmas is not that far away when it comes to getting custom jewelry made. If you hope to get a ring, buy a stone from us and take it to your jeweler (or make something yourself). I guarantee this new trove is producing the very finest Isle Royale Greenstones available. I have cut thousands of Greenstones, and these new (old) gemstones are great quality stones.

We have been frantically trying to post up as many new Greenstone pendants as we can for Holiday Season sales. Most of the stones in this post can be found on our website.

See our pendants and cabs at Greenstone jewelry and cabochons

Read our history of the Michigan State Greenstone gem

Read interesting Isle Royale information

Visit the official Isle Royale NPS website

Chlorastrolite or Michigan Greenstone–State Gemstone

Piles of mine waste rocks used to abound in the Keweenaw. Not so much anymore. There’s a lot of Greenstone here, but where are they?

Let’s look at some interesting tidbits about Michigan Greenstone, the state gem.

After lobbying by the Michigan lapidary community, Isle Royale Greenstone (Chlorastrolite) became Michigans Official State Gemstone on February 21, 1972. Gov. William G. Milliken signed a bill that had rapidly sped through the legislature with overwhelming majorities.

Reportedly the lawmakers had some smart remarks to make before they were finished. One Senator from Kalamazoo (Anthony Stamm), said It looks like stuff I put on my driveway at $40 a load. Another legislator wanted to know if Chlorastrolite was any relation to the stuff that clogs arteries.Another lawmaker explained If you think my wife is going to trade in her Diamond for a Greenstone, you have rocks in your head.

A beautiful Isle Royale Greenstone.

Chemically Chlorastrolite is Hydrous Calcium Aluminum Silicate. It commonly has a polygonal mosaic pattern sometimes referred to as an alligator pattern. It can be light or dark green, but the pattern is much showier in lighter shades. Lighter green predominates Greenstones from Isle Royale, while many Keweenaw Greenstones are darker. A desirable Greenstone trait shows radiating lines exhibiting Chatoyancy like Tiger-eye.

A solid Greenstone has a hardness of 5.5 to 6.

Tumbled Greenstones ready for sorting. Most of these are good for jewelry.

Chlorastrolite is formed in vesicles (small holes in bubbly Botryoidal lava) in the upper strata of the lava flows. In many cases in the Keweenaw, the vesicles do not completely fill, and you get hollow nodules. Imagine cutting a large Greenstone, thinking how big and splendid and special it is, plus how much money it might be worth, and all of a sudden, you bust through to a hollow center. Everyone that cuts quantities of Greenstone has done this. It’s very frustrating indeed. I will leave out the expletives uttered when this happens.

On the other hand, sometimes a hollow core may have been later filled with another precious mineral found in this area–Thomsonite, Prehnite, Datolite, or even Copper. These elicit a WHOOP! sound from me. I have even seen hollow Greenstone with copper crystals inside. (For more on my favorite Greenstones with inclusions read The Shades and Patterns of Greenstone (Chlorastrolite) May 1, 2016

Sometimes I just take the entire Greenstone and matrix and pop the Greenstone out as needed.

A Greenstone found underwater off Isle Royale in1961 by Arthur Vierthaler is in the Smithsonian and is claimed to be the largest Greenstone ever found at one and a half inch by three inches. I have seen many larger, and have personally cut a two inch by four inch one myself.

Shall we go way back in time? In the 1890s to the 1900s Isle Royale Greenstones started to appear in New York City. Socialites assumed they were of French origin because of the name. These ladies were somewhat lacking in geographical knowledge, and although there was minor interest in stones from romantic France, when it was found they were from a remote Island in Lake Superior, interest waned. Michigan Greenstones were relegated to the curio category and only had a passing interest.

Greenstones from Isle Royale. Collected 50 years ago.

Greenstones had more recognition in the Midwest where they could be purchased at Wisconsin and Northern Michigan barbershops and saloons. Today, Greenstone dealers still do not get the customers for Greenstones that they warrant. Because Michigan Greenstones come from such a limited area of the world, few people have ever seen one. They are basically a one source gemstone and that source is the Isle Royale National Park, (where they’re illegal to remove), or in the Keweenaw Peninsula, where they’re becoming more scarce because of all the Private property and all the old dump piles having been crushed and hauled away for road fill.

Michigan Greenstones may resemble several other vesicle-filled stones that are found in these areas. These nodules can be Chlorite balls, Chlorite covered shot copper, Copper agates, Greenstones, or other things. We may find what we call Greenstone Wanna-Bes. On the outside these appear as if they may be Greenstones, but when we grind them, they become green dust or mud. They just didn’t get fully baked by the geologic forces I guess!

Over the years I have accumulated not only vast amounts of Rocks, Minerals, and Fossils, but occasionally when I purchase an old collections from an Estate or garage sale, I also see old rock books or, if I am lucky, some notes or historic data on rocks and minerals.

Years ago I visited an estate sale of a well known Geologist/rockhound and discovered a couple boxes of documents, maps, notes, articles, and books no longer in print. To me, these are just as valuable as any rocks I might find. These papers and books contained secret locations, historical data, and many, many other valuable resources. I cannot explain you how excited I was to find these boxes; even more excited then finding that bonus fry or three on the bottom of the McDonalds bag.

I started to dig through these boxes and other archival resources and see what tidbits I could find on Chlorastrolite (AKA Greenstone). I know I have written about Michigans State Gemstone many times, but I am always looking to find something new from the old articles. Much of the information in this blog is from my treasure trove of old resources.

The Chlorastrolite Now Michigans Official Gem by E.W. Courter Lapidary Journal November 1974

Footnote on Chlorastrolites by Lee Carter Lapidary Journal October 1969

Other information delved from papers of the late Don H. Clarke

At Snob Appeal Jewelry we sell high-quality, hand-crafted, wire-wrapped stone jewelry specializing in stones from the Great Lakes Area. You can see our Michigan Greenstone cabochons and jewelry, Lake Superior Agate jewelry and other Keweenaw stones, Petoskey Stone jewelry,and stone and agate jewelry from around the world.

Datolite Jewelry from Keweenaw Datolite

Caledonia Gem Red

We offer a wide selection of gemstone jewelry from Great Lakes stones, but a favorite gem of ours may be one you have never heard of. We are pleased to offer a great selection of Datolite Pendants, because it is so unique, colorful, coppery, and generally surprising. Datolite is not one of those “pretty sounding” jewelry names like Larimar or Sleeping Beauty Turquoise, but it is indeed very beautiful and exceedingly rare, particularly in bright, pastel colors that some of the mines were famous for. Datolite is a Michigan gemstone that should be better known.

Franklin

Mesnard

Quincy

Clark Mine

The old Copper Mines of Michigan’s historic Copper Country have produced colorful Datolite of which there is no comparison. We are fortunate to have hunted Datolite, and bought old collections over the last 30 years, always looking for great colors. Finding coveted, colorful Datolite today is rare because of several factors.

Caledonia

Closeup showing massive copper content. This Datolite virtually shines in the sun from the copper content.

HUNTING DATOLITE TODAY

Over the past 5 years many of the old copper spoil piles have sadly been crushed and used as road fill, both under paved roads and to stabilize forest roads for logging operations. Most of the few old mine dump piles left are privately owed and unfortunately, but understandably, in this lawsuit-happy world, the owners are hesitant to permit rock picking on their piles. Unstable rock piles can be quite hazardous and we hear of injuries every year caused by many factors. Frivolous lawsuits can totally dissuade what used to be rockhound-friendly mine owners from allowing anyone on their piles.

Copper, Calcite, and Datolite from the Central Mine.

Deleware

Gorgeous Mesnard

I have always felt that if I am collecting rocks it’s my owe damn fault if I injure myself. i always have my mind trained to automatically think “If i do this, then this might happen”, especially while climbing around on, or moving rocks. Money hungry specimen miners have even tunneled into rock spoil piles in the winter for valuable, colorful Datolite in years past.

MINERAL INFORMATION

Like most of the minerals and metals in the Keweenaw Copper Country, Datolite was formed in the amygdaloidal basalt through hydrothermal precipitation. It is associated with prehnite, epidote, native copper, calcite and a variety of zeolites. You could also say it is associated with chlorastrolite as it may be included in the greenstone, as can zeolites.

The Mohs hardness of Datolite is stated to be 5.5, but from my cutting experience, the hardness can vary even within a nodule or Datolite piece. Other minerals mixed in with Datolite can also be of different hardnesses, which makes cutting and polishing a copper-included Datolite quite challenging. A Datolite from the Keweenaw Peninsula can either form in seams or as nodules with a texture of cauliflower, with no hint of what is within. The most Datolites are white and have been found in all the Datolite collecting areas. Savvy Datolite hunters look for Nodules that have a light colored, cauliflower-looking skin and often porcelain-looking shards of white on the piles. Often what is found may indeed be some old dinnerware, but other times it is Datolite. Datolite is a Calciumborosilicate and it’s not unusual that it may resemble glass or porcelain. Some high temperature, high strength glass, such as Pyrex, is a BoroSillicate. One of the most glass-like, solid Datolite, from my experience, was found at the Isle Royale Mine #7 near the now Walmart location in Houghton. The Datolite from the Isle Royale Mine #7 has been made into very stable beads in the past, harder and higher in Silica than most other area mines. It is normally a translucent very pale white-green, but very nice blue Datolite has been found at the Isle Royale.

Quincy

Isle Royale Mine pendant and beads.

Isle Royale Mine Blue

DATOLITE COLORS

Experienced Datolite hunters are able to make educated guesses as to what mine a Datolite came from, based on color and crust. Keweenaw Datolite has long been treasured for jewelry and offers a broad spectrum of the rainbow. The Canary yellow from Keweenaw Point, the blue/greens from Centennial, and apple reds from various mines, and bright orange/yellows from the Quincy/Franklin/Mesnard mines are some of the most coveted. A great source of pictures to identify Datolite colors from different mines is Jeff Anderson’s Dwarves Treasures page. His favorite mineral is Datolite and he has sample Datolites from many locations.

My metaphysical friends tell me that Datolite can sharpen all mental abilities. I’m afraid that even though I have worked with Datolite for many years I still forget things. I tell people I’m in my “Wonder Years”; just today I wondered what day it was, where my TV tuner was, where my car was parked, and where Bonnie (wife) went to.

Even though I’ve owed this spectacular 38 Gram piece of luscious canary yellow Keweenaw Point Datolite for some time, you’ve never seen it. I have not decided what I’m going to do with it yet. High Grade Yellow Point Datolite is the most rare of Keweenaw Datolites, therefore the most valuable Datolite there is. I did not enhance this Datolite; This is exactly what it looks like.

The prices of Datolite Jewelry can vary widely based on scarcity, color, size, and quality. Remember that because of the vanishing mine dump piles, Datolite hunting is now very limited. Many prime locations of the past are long gone, buried, flooded, or ground up. These factors combine to make Datolite jewelry pieces great heirloom treasures which can be passed down through your family with their story. Many times someone will be seeking a Datolite from a certain mine because a relative had worked there many years ago. Quincy or Delaware Datolites are popular because people want to remember their tour of those mines.

Datolite pendants are very popular at Copper World, our retail outlet in Calumet. You may be able to purchase a rough Datolite there also.

Really good Datolite (jewelry) is a great investment, and like Western Turquoise, many the sources are no longer available. Any jewelry from Michigan’s Copper District is a good investment with a historic backstory, but for color and variety you can’t beat Datolite Jewelry.

Copper Banded Agates

Bonnie has a good hole dug, and is looking for little green nodules that may be Copper Agates.

I’m not too far away in my own hole.

After 20 years of searching the mine spoil piles in the Keweenaw, with great success, I have to admit one of my biggest blunders. I used to dig large holes in the what was left of the C&H pile, near Calumet, with my buddy Bill, looking for Datolites. At that time, if I came across a piece of copper while Datolite digging, I would keep it, but I would also find other Chlorite covered nodules, that we would call copper balls and just heave them out of the hole.

You would never believe whats may be inside these nodules.

Here’s the suprise.

Today these Chlorite covered nodules are coveted by collectors around the world. You guessed it–Many of these nodules we threw away were Copper Banded (Infused) Agates. Nobody knew at that time that these things would end up being valuable gemstones. Later I learned that my friend, the late John Perona and his brother knew about these agates for many years. Today, we also know that these special agates are found nowhere else in the world except in the Kearsarge Lode. The Powebic Lode to the South where the Quincy, Mesnard, and Franklin Mines resided, have not produced Copper Agates. You do not see Copper Agates in the rocks of the Fissure and Stratiform Deposits to the North either; so the Kearsarge Lode of the Calumet Conglomerate is very unique indeed.

Careful cutting is involved with these Copper Agates.

It’s been so many years that I forgot where my hole was, and the area has been tilled up a few times, so all those agates I threw out; who knows where they are. I actually looked for my old hole last time I was in the area. I clearly forgot where it was.

A diligent and alert Rockhound can still find Copper Agates in the Kearsarge Lode if they are willing to put in some work excavating and carefully observing the pieces of spoil rock that might contain nodules that read “hot” with a pinpoint metal detector. I enjoy sitting down and digging, especially in late August, after Black Fly season. It’s even better if it’s raining. These little balls of glory stand out a whole lot better in the rain. the usual scenario is you see a rock of rubble with nodules in it and try to extract them with tools.

How these agates formed is debatable, but the theory that makes the most sense is suggested by the Lynch brothers in their fine book Agates of Lake Superior. You’ll have to read the book to see what they say about Copper Infused Agates. I prefer that term over Copper Replacement Agates, but most of the time I just refer to them as “Copper Agates“.

My last trip involved some very successful Greenstone digging, but no Copper Agate hunting. I only had limited rock hunting time this trip, so I had to chose between Greenstones or Copper Agates.

Copper Agates are rarely really large, but some real sizable. Fully banded beauties, are sometimes found as large as a half dollar. I’m happy to find a dime sized one, but like Greenstones, a big hunker is very welcome, and always elicits a “WHOOP!”.

Here are most of those Cabochons from above turned intoÂ jewelry. All these are for sale at: www.snobappealjewelry.com

I do have miner friends in the area that usually have some Copper Agates for sale, so I always buy a few. I purchase these agates with the question; Can I make these better? If I believe that I can, I will take them home for a re-work before making jewelry. Most often Copper Agates are cut in half and sold as a pair, but often I take a pair and grind the rind off the outside where better banding may appear (or may not). Often, the odd shapes of these nodules do not allow working the outside rind, due to all the gaps and dips in the stones, so these I either work with what the slice has produced or just sell or trade these for specimens. Most Copper Agates are bought as specimens and not so much for jewelry.

The Kearsage Lode also produces small pastel, banded agates that have little of no copper in them, but are very fine; we refer to these as “mine agates”. When found these are also Chlorite covered, just as are the Copper Banded Agates. I take everything and sort them by removing the crust in my home shop.

I work Copper Agates using my soft wheels only with loads of water to keep them cool and, for proper lubrication, an additive is added to the water when cutting. Special grinding techniques are used also. I generally treat these Copper Infused Agates with a coating to make them tarnish resistant, rather than polishing them. The coating I use is one of my trade secrets.

I sell Copper Agate pendants on line, at art shows and within a mile of where I find them, at Copper World, in Calumet. The jewelry I make from these rare agates is spectacular, simply because the Copper Agates are spectacular. It seems as though Copper Banded Agates are becoming very popular as of late. I have a good selection now, and you should remember, the closer to Christmas, the more your choice narrows.

I hope you have sensed my frustration at having tossed out hundreds of Copper Agates. I’ve got to work on my memory, because if I get it back, I’ll be INFUSED with Copper Infused Agates.