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This is a plump greenstone, with a calcite seam shooting through the greenstone pattern. The typical alligator pattern greenstone covers about a quarter of the stone. For a person who likes the greenstone that is a little out of the ordinary. The greenstone, also known as chlorastrolite, is the state gem of Michigan and is found only is small select areas of the Keweenaw Peninsula or on Isle Royale National Park. 1.9 grams