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Epidote VIII - Sorosilicates (Epidote Group)

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Name		Epidote (Pistacite)
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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