Topaz

Topaz: mineral with the chemical formula Al2(F,OH)2SiO4. It ranges from transparent to translucent, with a vitreous luster and colors from green to yellow, brown, blue, red, and colorless. It crystallizes in the Orthorhombic System. Found in acidic magmatic rocks and alluvial deposits.

(Photo: Parent Géry/Wikimedia Commons, License CC BY-SA 3.0)
(Photo: Rob Lavinsky, iRocks.com – CC-BY-SA-3.0/v, License CC BY-SA 3.0)

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