Uvarovite
From The Gemology Project
| Uvarovite Garnet | |
|---|---|
| Chemical composition | Ca3Cr2(SiO4)3
Calcium chromium silicate |
| Crystal system | Cubic |
| Habit | Dodecahedra |
| Cleavage | None |
| Hardness | 7.5 |
| Optic nature | Isotropic |
| Refractive index | 1.86-1.87 |
| Birefringence | None |
| Specific gravity | 3.77 |
| Lustre | Vitreous |
Uvarovite
Photo courtesy of Rick Martin
Photo courtesy of Rick Martin
Uvarovite is hardly ever found in crystals large enough to be cut into gemstones.
