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triclinic
Plagioclase (Albite Twin)
(Na,Ca)(Al,Si)4O8
Quick Facts
Hardness
6.0
Specific Gravity
2.62
Refractive Index
1.525
Crystal Structure
triclinic[-1]:{010}@1.0 + {001}@0.8 + {100}@0.5 + {110}@0.4 | twin(albite) triclinic
-1
{010} {001} {100} {110}
Physical Properties
Crystal Systemtriclinic
Hardness (Mohs)6.0
Specific Gravity2.62
CleavagePerfect in two directions at approximately 90 degrees
FractureUneven to conchoidal
LustreVitreous to pearly
Optical Properties
Refractive Index1.525
Birefringence0.007-0.013
PleochroismNone to weak
Dispersion0.012
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Open in Playground triclinic[-1]:{010}@1.0 + {001}@0.8 + {100}@0.5 + {110}@0.4 | twin(albite) Related Minerals
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