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Quartz IV - Oxides

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Name		Quartz
Chemistry		SiO2
Hardness		7
Lustre		vitreous
Colour		colourless, brown, violett, grey, yellow
Streak		white
Density [g/cm3]		2.65
Crystal habit		trigonal-trapezohedral, crystals often columnar
Cleavage, Fracture		fracture conchoidal
other characteristics and occurrences		conversion of b-quartz to a-quartz at 573°C rock crystal = clear, colourless amethyst     = purple smoky quartz = brown to black milky quartz = cloudy white citrine      = yellow brown rose quartz  = pink to reddish pink

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

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