Chlorastrolite
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Physical & Optical Properties
Mohs Hardness
Crystal System
Value & Market
Where to Buy Chlorastrolite
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About Chlorastrolite
Chlorastrolite, known as the 'Isle Royale greenstone,' is a rare green pumpellyite mineral displaying a distinctive turtleback chatoyancy produced by radiating fibrous crystal aggregates, found primarily on Lake Superior's Isle Royale and the Keweenaw Peninsula of Michigan, USA. Designated Michigan's state gem in 1972, it is cherished as a uniquely American gemstone with a limited and protected natural source. Its mossy green turtleback patterning is entirely unlike any other gemstone material.