Cassiterite vs Corundum
| Property | Cassiterite | Corundum |
|---|---|---|
| Formula | SnO2 | Al2O3 |
| Crystal System | Tetragonal | Trigonal |
| Mineral Class | 04 Oxides and Hydroxides | 04 Oxides and Hydroxides |
| Mohs Hardness | 6.0-7.0 | 9.0 |
| Color | Brown, black, reddish-brown, yellow | Red (ruby), blue (sapphire), various colors |
| Luster | Adamantine | Adamantine |
| Streak | White to pale brown | Colorless |
| Transparency | Translucent | Transparent |
| Cleavage | Poor {100} | None |
| Fracture | Subconchoidal to uneven | Conchoidal to uneven |