Celestine vs Staurolite
| Property | Celestine | Staurolite |
|---|---|---|
| Formula | SrSO4 | Fe2Al9Si4O23(OH) |
| Crystal System | Orthorhombic | Monoclinic |
| Mineral Class | 07 Sulfates, Chromates, Molybdates, and Tungstates | 09 Silicates |
| Mohs Hardness | 3.0-3.5 | 7.0-7.5 |
| Color | Colorless, pale blue, white, yellow | Dark reddish-brown to black |
| Luster | Vitreous | Vitreous |
| Streak | White | Gray to white |
| Transparency | Transparent | Translucent |
| Cleavage | Perfect {001} | Poor {010} |
| Fracture | Uneven | Subconchoidal |