Apatite vs Staurolite
| Property | Apatite | Staurolite |
|---|---|---|
| Formula | Ca5(PO4)3(F,Cl,OH) | Fe2Al9Si4O23(OH) |
| Crystal System | Hexagonal | Monoclinic |
| Mineral Class | 08 Phosphates, Arsenates, and Vanadates | 09 Silicates |
| Mohs Hardness | 5.0 | 7.0-7.5 |
| Color | Green, blue, yellow, violet, colorless | Dark reddish-brown to black |
| Luster | Vitreous | Vitreous |
| Streak | White | Gray to white |
| Transparency | Transparent | Translucent |
| Cleavage | Poor {0001} | Poor {010} |
| Fracture | Conchoidal to uneven | Subconchoidal |