Template:Apatite
From The Gemology Project
Revision as of 11:34, 1 November 2006 by Africanuck (talk | contribs)
Apatite | |
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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 |