monoclinic
Gypsum
CaSO4.2H2O
Quick Facts
Hardness
2
Specific Gravity
2.31-2.33
Refractive Index
1.520-1.530
Crystal Structure
monoclinic[2/m]:{010}@1.0 + {100}@0.7 + {001}@0.8 + {111}@0.5 monoclinic
2/m
{010} {100} {001} {111}
Physical Properties
Crystal Systemmonoclinic
Hardness (Mohs)2
Specific Gravity2.31-2.33
CleavagePerfect {010}, good {100} and {011}
FractureConchoidal to splintery
LustreVitreous to pearly (on cleavage surfaces)
Optical Properties
Refractive Index1.520-1.530
Birefringence0.009-0.010
PleochroismNone
Dispersion0.033
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Open in Playground monoclinic[2/m]:{010}@1.0 + {100}@0.7 + {001}@0.8 + {111}@0.5 Related Minerals
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