Kyanite vs Siderite
| Property | Kyanite | Siderite |
|---|---|---|
| Formula | Al2SiO5 | FeCO3 |
| Crystal System | Triclinic | Trigonal |
| Mineral Class | 09 Silicates | 05 Carbonates and Nitrates |
| Mohs Hardness | 4.5-7.0 | 3.5-4.5 |
| Color | Blue, white, gray, green | Yellowish-brown, gray, brown, greenish |
| Luster | Vitreous | Vitreous |
| Streak | Colorless | White |
| Transparency | Translucent | Translucent |
| Cleavage | Perfect {100} | Perfect rhombohedral {1011} |
| Fracture | Splintery | Conchoidal |