Kornerupine
From The Gemology Project
| Kornerupine | |
|---|---|
| Chemical composition | Complex borosilicate |
| Crystal system | Orthorhombic |
| Habit | Prismatic |
| Cleavage | Prismatic |
| Fracture | Conchoidal |
| Hardness | 6.5 |
| Optic nature | Biaxial - |
| Refractive index | 1.67 -1.68 |
| Birefringence | 0.013 |
| Dispersion | Low, 0.019 |
| Specific gravity | 3.28 - 3.35 |
| Lustre | Vitreous |
| Pleochroism | Distinct (green, yellow, brown) |
