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Topaz

What is Topaz? Group: silicates Sub-group: nesosubsilicates Etymology: uncertain: may come from the Greek "topazos", the ancient name of the island of Zabargad in the Red Sea, or from the Sanskrit "tapaz" meaning "fire". Hardness (Mohs scale): 8 Main deposits: Brazil, Madagascar, Russia, Sri Lanka... Colors: colorless, yellow, orange, pink, blue... Chemical composition: Al2SiO4(F, OH)2 Crystal system: orthorhombic Constitution: aluminum fluosilicate Development environment: pegmatites and high-temperature quartz veins.

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