16.69: Turquoise
- Page ID
- 6499
| Turquoise | |
|---|---|
| Chemical composition | CuAl6(PO4)4(OH)8.5H2O |
| Crystal system | Triclinic |
| Habit | Botryoidal, massive, microcrystalline to granular |
| Fracture | Conchoidal |
| Hardness | 5.0 - 6.0 |
| Refractive index | 1.610-1.650 |
| Specific gravity | 2.30-2.90 |
| Lustre | Waxy |
Figure \(\PageIndex{1}\): Persian turquoise