A green variety of the mineral tourmaline, prized as a gemstone, with a distinctive radial crystal pattern when cut.
From chlor- (green) + astrolite (from Greek 'astron' star + 'lithos' stone). Named for the star-like pattern visible when polished.
Chlorastrolite is Michigan's official state stone, and it's famous for showing a beautiful asterism—a star pattern that appears when light hits it, caused by tiny aligned crystals!
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