triclinic
Labradorite
(Ca,Na)(Al,Si)4O8
Quick Facts
Hardness
6-6.5
Specific Gravity
2.69-2.72
Refractive Index
1.559-1.568
Crystal Structure
triclinic[-1]:{010}@1.0 + {001}@0.8 + {110}@0.6 triclinic
-1
{010} {001} {110}
Physical Properties
Crystal Systemtriclinic
Hardness (Mohs)6-6.5
Specific Gravity2.69-2.72
CleavagePerfect in two directions at ~90 degrees
FractureUneven to conchoidal
LustreVitreous to pearly
Optical Properties
Refractive Index1.559-1.568
Birefringence0.008-0.010
PleochroismNone to weak
Dispersion0.012
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Open in Playground triclinic[-1]:{010}@1.0 + {001}@0.8 + {110}@0.6 Related Minerals
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