Home Andalusite
VIII - Nesosilicates
Crystal habit of Andalusite

Name   Andalusite
Chemistry   Al[6]Al[5][O|SiO4] = Al2SiO5
Hardness   7.5
Lustre   vitreous
Colour   grey, brown, dark green, red, often reddish brown
Streak   white 
Density [g/cm3]   3.1
Crystal habit   orthorhombic, crystals prismatic [110] with nearly square cross section
Cleavage, Fracture   [101] good, [010] poor, fracture conchoidal
other characteristics and occurrences   chiastolite = crystal with dark inclusions (often clay) in the form of a cross
typical metamorphic mineral, polymorph (same chemistry, different structure) with kyanite and sillimanite

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