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VIII - Sorosilicates (Epidote Group)
Crystal habit of Epidote Epidote

Name   Epidote
Chemistry   Ca2(Al,Fe)Al2[O|OH|SiO4|Si2O7]
Hardness   6 - 7
Lustre   vitreous
Colour   dark green, blue green, blackish green, light green to grey
Streak   grey 
Density [g/cm3]   3.3 - 3.5
Crystal habit   monoclinic, crystals long, prismatic, dense, striated
Cleavage, Fracture   [001] perfect, fracture conchoidal to splintery
other characteristics and occurrences   pistacite    = Fe-rich, green
clinozoisite = Fe-poor, grey
contact pneumatolytic mineral, formed by thermal decay of Al- and Ca-containing silicates (feldspar, hornblende)

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