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fuckyeahmineralogy: Blue Topaz (Al2SiO4(F,OH)2) is an orthorhombic crystal, when pure, is colorless. Like quartz, the color of topaz is due to impurities. Blue Topaz is very rare, and is also the state gem of Texas.
fuckyeahmineralogy: Blue Topaz (Al2SiO4(F,OH)2) is an orthorhombic crystal, when pure, is colorless. Like quartz, the color of topaz is due to impurities. Blue Topaz is very rare, and is also the state gem of Texas.