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])
   

This page in German - Diese Seite in Deutsch
© 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
These recommendations are believed to be correct. However, no guarantee of their accuracy is given. Therefore, purchasers shall make their own tests to determine suitability for their use. These products are offered for industrial and related uses (e.g. research and development) only. However the user must take the necessary precautions appropriate for products containing chemicals. This description does not imply the absence of any patents, the responsibility whatsoever solely rests with the user.