Ca2(Al,Fe)3(SiO4)3(OH)Monoclinic

Epidote

Ca2(Al,Fe)3(SiO4)3(OH)

Silicates
Chemical FormulaCa2(Al,Fe)3(SiO4)3(OH)
Crystal SystemMonoclinic
Mohs Hardness6
Specific Gravity3.45
ColorPistachio green, yellowish green, black
LusterVitreous
StreakGrayish white
CleavageOne direction
FractureUneven

Occurrence

Found in metamorphic rocks. Characteristic pistachio green color.

Hardness on Mohs Scale

6 / 10
Talc (1)Quartz (7)Diamond (10)