Isle Royale Greenstone
Isle Royale Greenstone, also known as the mineral Chlorastrolite, is the State Gem of Michigan. It can be found almost exclusively along the shores of the Keweenaw Peninsula and throughout the Isle Royale archipelago. However, you can not collect these gemstones in the Isle Royale National Park. You can collect them in other areas of the Keweenaw Peninsula.
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