Template:Apatite
From The Gemology Project
Apatite | |
---|---|
Chemical composition | Ca5(PO4)3(F,Cl,OH) |
Crystal system | Hexagonal |
Habit | Prismatic |
Cleavage | Imperfect, basal |
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 |