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Topaz
nesosilicate mineral / From Wikipedia, the free encyclopedia
Topaz is a silicate mineral. Along with silicate, it includes the chemical elements aluminium and fluorine with the chemical formula Al2SiO4(F,OH)2.
Quick Facts General, Category ...
Topaz | |
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![]() Topaz crystal on matrix | |
General | |
Category | Nesosilicate |
Formula (repeating unit) | Al2SiO4(F,OH)2 |
Strunz classification | 9.AF.35 |
Crystal symmetry | Orthorhombic dipyramidal H-M symbol: (2/m 2/m 2/m) Space group: Pbnm |
Unit cell | a = 4.65 Å, b = 8.8 Å, c = 8.4 Å; Z = 4 |
Identification | |
Color | Colorless (if no impurities), blue, brown, orange, gray, yellow, green, pink and reddish pink |
Mohs scale hardness | 8 (defining mineral) |
Luster | Vitreous |
Birefringence | δ = 0.010 |
References | [1][2][3][4] |
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