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Michigan Greenstone Cabochon 1.4 grams
Gs766
New
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
1 Item
Unique Item
More info
A nice Michigan Greenstone for a special jewelry project.
The Michigan State Gem is commonly called "Greenstone", "Michigan Greenstone" or "Isle Royal Greenstone". The correct mineral name is Chlorastrolite, a variety of pumpellyite. Chlorastrolite is found as small pebbles on the beaches of Isle Royale in Lake Superior and also throughout the Keweenaw Peninsula. Greenstone is associated with the native copper deposits of Northern Michigan. The Michigan Greenstones are found as green/black nodules in vesicles of the amygdaloidal basalts. Most greenstones are smaller than a pea, and really large ones are extremely rare.
