monoclinic
Epidote
Ca2(Al,Fe)3(SiO4)3(OH)
Quick Facts
Hardness
6-7
Specific Gravity
3.35-3.50
Refractive Index
1.729-1.768
Crystal Structure
monoclinic[2/m]:{100}@1.0 + {001}@0.8 + {010}@0.7 + {110}@0.5 monoclinic
2/m
{100} {001} {010} {110}
Physical Properties
Crystal Systemmonoclinic
Hardness (Mohs)6-7
Specific Gravity3.35-3.50
CleavagePerfect {001}, imperfect {100}
FractureUneven
LustreVitreous
Optical Properties
Refractive Index1.729-1.768
Birefringence0.019-0.046
PleochroismStrong trichroic (green, brown, yellow)
Dispersion0.03
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Open in Playground monoclinic[2/m]:{100}@1.0 + {001}@0.8 + {010}@0.7 + {110}@0.5 Related Minerals
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