triclinic
Kyanite
Al2SiO5
Quick Facts
Hardness
4-7 (variable)
Specific Gravity
3.53-3.68
Refractive Index
1.716-1.731
Crystal Structure
triclinic[-1]:{100}@1.0 + {010}@0.4 + {001}@1.5 + {110}@0.6 triclinic
-1
{100} {010} {001} {110}
Physical Properties
Crystal Systemtriclinic
Hardness (Mohs)4-7 (variable)
Specific Gravity3.53-3.68
CleavagePerfect {100}, good {010}
FractureSplintery
LustreVitreous to pearly
Optical Properties
Refractive Index1.716-1.731
Birefringence0.012-0.017
PleochroismModerate dichroic (colorless, dark blue, violet-blue in blue material)
Dispersion0.02
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Open in Playground triclinic[-1]:{100}@1.0 + {010}@0.4 + {001}@1.5 + {110}@0.6 Related Minerals
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