Home Zinnwaldite
VIII - Phyllosilicates (Mica Group)		 Crystal habit of Zinnwaldite Zinnwaldite
 
Name   Zinnwaldite
Chemistry   KLiFe2+Al[(OH,F)2|AlSi3O10]
Hardness   2.5
Lustre   pearly - metallic
Colour   pale violet, silver grey, yellow, brown, nearly black
Streak   white
Density [g/cm3]   2.9 - 3.1
Crystal habit   monoclinic, crystals pseudohexagonal
Cleavage, Fracture   [001] perfect
other characteristics and occurrences   pneumatolytic mineral in cassiterite (SnO2)- and topaz (Al2[(OH,F)2|SiO4]) -bearing pegmatites
   
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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