orthorhombic
Peridot
(Mg,Fe)2SiO4
Quick Facts
Hardness
6.5
Specific Gravity
3.27
Refractive Index
1.654
Crystal Structure
orthorhombic[mmm]:{110}@1.0 + {010}@0.7 + {021}@0.5 orthorhombic
mmm
{110} {010} {021}
Physical Properties
Crystal Systemorthorhombic
Hardness (Mohs)6.5
Specific Gravity3.27
CleavagePoor
FractureConchoidal
LustreVitreous to oily
Optical Properties
Refractive Index1.654
Birefringence0.035-0.038
PleochroismWeak (yellowish-green, green, greenish-yellow)
Dispersion0.02
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