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VIII - Nesosilicates
Crystal habit of Kyanite Kyanite

Name   Kyanite
Chemistry   Al[6]Al[5][O|SiO4] = Al2SiO5
Hardness   4.5 (parallel to long axis), 6 - 7 (across the long axis)
Lustre   pearly - vitreous
Colour   blue, white, pink, colour often not constituent throughout the crystal
Streak   white 
Density [g/cm3]   3.6
Crystal habit   triclinic, crystals flat, prismatic, often embedded in rocks
Cleavage, Fracture   [100] perfect, [010] distinct, fracture splintery
other characteristics and occurrences   polymorph (same chemistry, different structure) with andalusite and sillimanite,
in Al-rich, metamorphic pegmatites (gneiss, schists) together with garnet, staurolite and mica

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