Template:Ruby
From The Gemology Project
Ruby | |
---|---|
Chemical composition | Al2O3 |
Crystal system | Trigonal |
Habit | Prismatic, tabular |
Cleavage | Poor |
Fracture | Conchoidal |
Hardness | 9 |
Optic nature | Uniaxial - |
Refractive index | 1.76-1.78 |
Birefringence | 0.008-0.009 |
Dispersion | Low, 0.018 |
Specific gravity | 4 |
Lustre | Bright vitreous |
Pleochroism | Weak to moderate |