Difference between revisions of "Ruby"
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Revision as of 23:23, 13 September 2006
Ruby | |
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Chemical composition | Al2O3 |
Crystal system | Trigonal |
Habit | Prismatic, tabular |
Cleavage | None, twinned stones may show parting |
Fracture | Conchoidal |
Hardness | 9 |
Optic nature | Uniaxial - |
Refractive index | 1.762-1.770 (+.009,-.005) |
Birefringence | 0.008-0.010 |
Dispersion | Low, 0.018 |
Specific gravity | 4 |
Lustre | Vitreous to subadamantine |
Pleochroism | Strong; puplish-red to orangy-red |