Topaz is a form of aluminum silicate with fluorine. Chemically, the composition of topaz can be represented by the formula Al2SiO4(F,OH)2. Topaz crystals are generally prismatic, and terminate in pyramidal or other faces. Topaz crystals often have well-developed basal cleavage. Cutting and polishing the crystals as gemstones requires particular care. Topaz typically crystallizes in granitic [...]
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