Mineral | Corrundum |
---|---|
Chemistry | Al2O3 |
Color | Pale - Deep Purple |
Refractive Index | 1.762 - 1.770 |
Birefringence | 0.008 - 0.010 |
Specific Gravity | 4.00 |
Mohs Hardness | 9.0 |
4.58ct (RD0493)
7.64ct - 13x11mm (RD0159)
7.41ct - 15x13mm (MZ0067)
2.49ct - 8x6mm (PS0033)
3.50ct - 10x8mm (PS0028)
3.03ct - 9x7mm (PS0026)
3.55ct (PS0025)