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VIII - Phyllosilicates (Mica Group)
Crystal habit of Biotite Biotite

 
Name   Biotite
Chemistry   K(Mg,Fe2+)3[(OH,F)2|(Al,Fe3+)Si3O10]
Hardness   2.5 - 3
Lustre   vitreous - pearly
Colour   dark brwon, black, dark green
Streak   white
Density [g/cm3]   2.8 - 3.2
Crystal habit   monoclinic, crystals pseudohexagonal, tabular
Cleavage, Fracture   [001] perfect
other characteristics and occurrences   fine to coarse grained, foliated, widely distributed, in many magmatic and metamorphic rocks
   

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