Chlorastrolite was declared Michigan's State Gem, but it is only found in a small portion of the state, the far north. It comes from Isle Royale (now a National Park where collecting is prohibited) and from certain copper areas of the Keweenaw Peninsula which juts out into Lake Superior. Created by volcanic action the host rock is mineral rich...
Chlorastrolite was declared Michigan's State Gem, but it is only found in a small portion of the state, the far north. It comes from Isle Royale (now a National Park where collecting is prohibited) and from certain copper areas of the Keweenaw Peninsula which juts out into Lake Superior. Created by volcanic action the host rock is mineral rich and was first valued for the copper found there. While finding copper, miners also found these small nodules of green, and sometimes they would polish into gemstone beauties. These are the treasures we crave, starry, well-patterned with geometric, chatoyant variations of dark and light green, and sometimes some pink Thomsonite or other inclusions. Greenstones have become quite scarce because old mine rock piles are being crushed and used for gravel. When you buy a Greenstone, you are investing in a rare gemstone. Our stones are well polished and ready for use in rings or other jewelry.
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Greenstone Cabochon .8 grams
Here’s a very luscious Greenstone chunk in an oval shape. Glossy pattern is surrounded by almost a frame of darker color. It's lovely. .8 grams 11mm x 9mm x 4mm
$89.00In Stock -
Greenstone Cabochon .89 gram with Thomsonite
An Isle Royale chlorastorlite Greenstone infused with Thomsonite, suitable for setting in fine jewelry.
$100.00In Stock -
Greenstone Cabochon 1 gram with Thomsonite
An Isle Royale chlorastorlite Greenstone infused with Thomsonite, suitable for setting in fine jewelry.
$135.00In Stock -
Greenstone Cabochon 1.4 grams
This is an excellent 1.4 gram chlorastrolite stone, with chatoyant alligator pattern across the surface of the stone. With a flat back, buy this Michigan State Gem ready to be set into jewelry. Approximately 10mm x 13mm x 4mm
$149.00In Stock -
Greenstone Cabochon 1.6 grams
A medium-sized Michigan Greenstone cabochon with a good thickness for stability, and a darker pattern as preferred by some customers. Use this for your own jewelry or add to your state gemstone collection. 14mm x 11mm x 6mm
$199.00In Stock -
Greenstone Cabochon 2 grams
Wow, look how big this is! With a nice sheen, it is slimly cut, and covers a large surface area with Michigan Greenstone pattern. Make this a star of your piece! 2 grams 19mm x 16mm x 3mm
$219.00In Stock -
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Isle Royale Greenstone Cabochon .6 grams
Light sage green and chatoyant, this is an excellent Isle Royale Greenstone for jewelry. .6 grams Approximately 11mm round dome 4mm
$89.00In Stock -
Michigan Greenstone .5 grams
An oval to round cabochon, quite flat, with the small round patterns expected on Michigan's Greenstone. .5 grams 7/8" x 3/4" or approximately .7mm x .9mm x .5mm
$59.00In Stock -
Michigan Greenstone Cabochon .9 grams
A round cabochon of Michigan's State Gem Greenstone, with a very uniform alligator pattern across the whole surface. .9grams Approximately 10mm x 11mm x .5mm
$125.00In Stock -
Michigan Greenstone Cabochon 1.4 grams
A tall chlorastrolite stone of unusual shape it has good pattern and a very small bit of calcite on one side. 1.4 grams Approximately 17mm x 10mm x 4mm
$139.00In Stock -
Michigan Greenstone Cabochon 1.7 grams
A slightly oval large cabochon of Michigan's State Gem Greenstone, chatoyant with an alligator pattern. 1.7grams Approximately 12mm x 15mm x 4mm
$199.00In Stock -
Michigan Greenstone Cabochon 2.4 grams
A squarish/round cabochon of Michigan's State Gem Greenstone, distinguished by laying over a layer of white calcite which sort of frames it. 2.4grams approximately 16mm x 15mm x .6mm
$200.00In Stock -
Teardrop Greenstone Cabochon .8 grams
Distinguished by an attractive teardrop shape, this is a slim flat stone with chatoyant circles across the surface, perfect for a nice pendant. 14mm x 10mm x 2mm
$109.00In Stock
