Anatase
From The Gemology Project
| Anatase | |
|---|---|
| Chemical composition | TiO2 |
| Crystal system | Tetragonal |
| Habit | Dipyramidal |
| Cleavage | Perfect |
| Fracture | Sub-conchoidal |
| Hardness | 5.5 - 6 (brittle) |
| Optic nature | Uniaxial - |
| Refractive index | 2.488 - 2.561 |
| Birefringence | 0.073 |
| Specific gravity | 3.89 |
| Lustre | Adamantine/metallic |
