Home Cummingtonite
VIII - Inosilicates (Amphibole Group)
Crystal habit of Cummingtonite

Name   Cummingtonite
Chemistry   (Mg,Fe)7[OH|Si4O11]2
Hardness   5 - 6
Lustre   vitreous - silky
Colour   dark grey, greenish brown, dark green
Streak   greyish white
Density [g/cm3]   3.1 - 3.6
Crystal habit   monoclinic
Cleavage, Fracture   [110] perfect, fracture splintery
other characteristics and occurrences   regional metamorphic rocks

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