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Topaz VIII - Nesosilicates

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Name		Topaz
Chemistry		Al2[(OH,F)2|SiO4]
Hardness		8
Lustre		vitreous
Colour		colourless, pale blue, yellow, wine yellow, yellowish brown, red
Streak		white
Density [g/cm3]		3.6
Crystal habit		orthorhombic, crystals short prismatic, striated, multifaceted
Cleavage, Fracture		[001] perfect, fracture conchoidal
other characteristics and occurrences		pycnite = yellowish white variety in pegmatites and quartz veins of high temperature, in druses in granites and rhyolites

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© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst

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