Home Sillimanite
VIII - Nesosilicates
Crystal habit of Sillimanite

Name   Sillimanite
Chemistry   Al[6]Al[5][O|SiO4] = Al2SiO5
Hardness   6 - 7
Lustre   vitreous
Colour   colourless, grey, grey green, yellowish grey
Streak   white 
Density [g/cm3]   3.2
Crystal habit   orthorhombic, no individual crystals
Cleavage, Fracture   [010] perfect, fracture uneven
other characteristics and occurrences   in metamorphic rocks of high temperature, wide spread occurrences, typical metamorphic mineral, polymorph (same chemistry, different structure) with andalusite and cyanite

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