Template:Apatite

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Apatite
Chemical composition Ca5(PO4)3(F,Cl,OH)
Crystal system hexagonal
Habit prismatic
Cleavage imperfect
Fracture conchoidal
Hardness 5
Optic nature uniaxial -
Refractive index 1.63-1.64
Birefringence 0.003
Dispersion low, 0.013
Specific gravity 3.2
Lustre vitreous
Pleochroism weak