Siderite vs Staurolite
| Property | Siderite | Staurolite |
|---|---|---|
| Formula | FeCO3 | Fe2Al9Si4O23(OH) |
| Crystal System | Trigonal | Monoclinic |
| Mineral Class | 05 Carbonates and Nitrates | 09 Silicates |
| Mohs Hardness | 3.5-4.5 | 7.0-7.5 |
| Color | Yellowish-brown, gray, brown, greenish | Dark reddish-brown to black |
| Luster | Vitreous | Vitreous |
| Streak | White | Gray to white |
| Transparency | Translucent | Translucent |
| Cleavage | Perfect rhombohedral {1011} | Poor {010} |
| Fracture | Conchoidal | Subconchoidal |