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I don't know why I am even selling this stone--I should keep it for myself! It is hard to describe this stone. With thomsonite, one very evident copper inclusion, a large prehnite patch and distinctive and unusual chlorastrolite pattern, this gem has it all! If you want a stone like nobody else in the world has, this is it! This is Michigan's state gem, with a lot more. These stones are found only is small select areas of the Keweenaw Peninsula or on Isle Royale National Park. This stone will blow your mind, it is well worth the price! 1.5 grams