monoclinic
Hiddenite
LiAlSi2O6:Cr
Quick Facts
Hardness
6.5-7
Specific Gravity
3.15-3.21
Refractive Index
1.660-1.676
Crystal Structure
monoclinic[2/m]:{110}@1.0 + {100}@0.7 + {001}@1.0 monoclinic
2/m
{110} {100} {001}
Physical Properties
Crystal Systemmonoclinic
Hardness (Mohs)6.5-7
Specific Gravity3.15-3.21
CleavagePerfect in two directions (spodumene cleavage)
FractureUneven to splintery
LustreVitreous
Optical Properties
Refractive Index1.660-1.676
Birefringence0.014-0.016
PleochroismStrong trichroic (blue-green, emerald green, yellow-green)
Dispersion0.017
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Open in Playground monoclinic[2/m]:{110}@1.0 + {100}@0.7 + {001}@1.0 Related Minerals
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