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Topaz
Topaze, quartz fumé 1.jpg
Topaz crystal on matrix
General
CategoryNesosilicate
Formula
(repeating unit)
Al2SiO4(F,OH)2
Strunz classification9.AF.35
Crystal symmetryOrthorhombic dipyramidal
H-M symbol: (2/m 2/m 2/m)
Space group: Pbnm
Unit cella = 4.65 Å, b = 8.8 Å,
c = 8.4 Å; Z = 4
Identification
ColorColorless (if no impurities), blue, brown, orange, gray, yellow, green, pink and reddish pink
Mohs scale hardness8 (defining mineral)
LusterVitreous
Birefringenceδ = 0.010
References

Topaz is a silicate mineral. Along with silicate, it includes the chemical elements aluminium and fluorine with the chemical formula Al2SiO4(F,OH)2.

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