Home Quartz
IV - Oxides
Crystal habit of beta-Quartz Crystal habit of alpha-Quartz Quartz Quartz (Amethyst) Quartz

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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