Difference between revisions of "Template:Apatite"
From The Gemology Project
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| Chemical composition || Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>(F,Cl,OH) | | Chemical composition || Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>(F,Cl,OH) | ||
|- | |- | ||
− | | Crystal system || | + | | Crystal system || Hexagonal |
|- | |- | ||
− | | Habit || | + | | Habit || Prismatic |
|- | |- | ||
− | | Cleavage || | + | | Cleavage || Imperfect, basal |
|- | |- | ||
− | | Fracture || | + | | Fracture || Conchoidal |
|- | |- | ||
| Hardness || 5 | | Hardness || 5 | ||
|- | |- | ||
− | | Optic nature || | + | | Optic nature || Uniaxial - |
|- | |- | ||
− | | | + | | Refractive index || 1.63-1.64 |
|- | |- | ||
| Birefringence || 0.003 | | Birefringence || 0.003 | ||
|- | |- | ||
− | | Dispersion || | + | | Dispersion || Low, 0.013 |
|- | |- | ||
| Specific gravity || 3.2 | | Specific gravity || 3.2 | ||
|- | |- | ||
− | | Lustre || | + | | Lustre || Vitreous |
|- | |- | ||
− | | Pleochroism || | + | | Pleochroism || Weak |
|} | |} |
Latest revision as of 10:29, 3 June 2007
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 |