monoclinic
Hiddenite
LiAlSi2O6:Cr
Quick Facts
Hardness
6.5
Specific Gravity
3.15
Refractive Index
1.66
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
Specific Gravity3.15
CleavagePerfect in two directions (spodumene cleavage)
FractureUneven to splintery
LustreVitreous
Optical Properties
Refractive Index1.66
Birefringence0.014-0.016
PleochroismStrong trichroic (blue-green, emerald green, yellow-green)
Dispersion0.017
Interactive Preview
Open this crystal in the CDL Playground to rotate, export, and explore in 3D.
Open in Playground monoclinic[2/m]:{110}@1.0 + {100}@0.7 + {001}@1.0 Related Minerals
Other minerals in the monoclinic system
