Information
Specific Gravity: 3.10 - 3.20
Hardness: 5.0
Refractive Index: 1.642 - 1.646 ( -0.011 / +0.023 )
Birefringence: 0.002 - 0.008
Crystal System: Hexagonal
Luster: Vitreous
Chemical Composition: Ca₅(PO₄)₃(F,Cl,OH)
Optical Character: Uniaxial (-)
Pleochroism: Weak To Very Weak
Transparency: Transparent To Opaque
Color: Colorless, White, Yellow, Green, Blue, Brown, Violet.
Remark: -