Epidote group

Epidote group
General
CategorySorosilicates
Formula(A2+1A2+2)(M3+1M3+2M3+3)O[Si2O7][SiO4](OH)
IMA symbolEp
Crystal systemMonoclinic
Crystal classPrismatic (2/m)
(same H–M symbol)
Space groupP21/m
Identification
ColorYellow-green, pistachio green, greenish black, brownish-green, green, black
Crystal habitPrismatic, fibrous, druse/encrustation, massive
TwinningOn [100]
Cleavage{001} perfect and {100} imperfect
Mohs scale hardness6–7
LusterVitreous

Epidotes are a group of sorosilicate minerals that are common in igneous and metamorphic rocks.

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