hexagonal
Apatite
Ca5(PO4)3(F,Cl,OH)
Quick Facts
Hardness
5.0
Specific Gravity
3.16
Refractive Index
1.628
Crystal Structure
hexagonal[6/mmm]:{10-10}@1.0 + {10-11}@0.8 + {0001}@0.5 hexagonal
6/mmm
{10-10} {10-11} {0001}
Physical Properties
Crystal Systemhexagonal
Hardness (Mohs)5.0
Specific Gravity3.16
CleavagePoor {0001}
FractureConchoidal to uneven
LustreVitreous to subresinous
Optical Properties
Refractive Index1.628
Birefringence0.002-0.008
PleochroismWeak to moderate in coloured varieties
Dispersion0.013
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Open in Playground hexagonal[6/mmm]:{10-10}@1.0 + {10-11}@0.8 + {0001}@0.5 Related Minerals
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