Hydrogrossular
From The Gemology Project
| Hydrogrossular Garnet | |
|---|---|
| Chemical composition | Ca3Al2(SiO4)3
Calcium aluminium silicate |
| Crystal system | Cubic |
| Habit | Dodecahedra |
| Cleavage | None |
| Hardness | 7.0-7.5 |
| Optic nature | Isotropic |
| Refractive index | 1.738-1.745 |
| Birefringence | None |
| Specific gravity | 3.60-3.68 |
| Lustre | Vitreous |
