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V - Borates
Crystal habit of Colemanite Colemanite

Name   Colemanite
Chemistry   Ca2B6O11·5H2O
Hardness   4.5
Lustre   vitreous
Colour   white to clear
Streak   white 
Density [g/cm3]   2.4
Crystal habit   monoclinic, crystals common
Cleavage, Fracture   [010] perfect, [001] distinct, fracture uneven
other characteristics and occurrences   also fibrous - long prismatic, occurrence in aride regions, formed by evaporation

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