Cut crystals of blue tanzanite

Cut crystals of blue tanzanite

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Credit: VAUGHAN FLEMING/SCIENCE PHOTO LIBRARY

Caption: Cut crystals of tanzanite, a blue variety of zoisite (hydrous calcium aluminium silicate) which contains impurities of chromium and strontium. Various shades of smokey-blue and vilolet-blue are seen here. Zoisite occurs in a variety of other colours including white, pale green and pink. Tanzanite is found only in Tanga province, Tanzania, and is considered an important gemstone.

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Keywords: blue, tanzanite, zoisite

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