Kyanite vs Turquoise
| Property | Kyanite | Turquoise |
|---|---|---|
| Formula | Al2SiO5 | CuAl6(PO4)4(OH)8 · 4H2O |
| Crystal System | Triclinic | Triclinic |
| Mineral Class | 09 Silicates | 08 Phosphates, Arsenates, and Vanadates |
| Mohs Hardness | 4.5-7.0 | 5.0-6.0 |
| Color | Blue, white, gray, green | Sky blue, blue-green, green |
| Luster | Vitreous | Waxy |
| Streak | Colorless | White to pale green |
| Transparency | Translucent | Translucent |
| Cleavage | Perfect {100} | None |
| Fracture | Splintery | Conchoidal |