Home Alunite
V - Sulfates
Crystal habit of Alunite

Name   Alunite
Chemistry   KAl3[(OH)6|(SO4)2]
Hardness   3.5 - 4
Lustre   vitreous, pearly
Colour   white, grey, yellowish grey, reddish grey or yellowish white 
Streak   white 
Density [g/cm3]   2.6 - 2.9
Crystal habit   trigonal
Cleavage, Fracture   [0001] good
other characteristics and occurrences   rock-forming mineral, formed by alteration of feldspar-rich rocks (orthoclase) (K[AlSi3O8])

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