Cassiterite vs Tourmaline
| Property | Cassiterite | Tourmaline |
|---|---|---|
| Formula | SnO2 | Complex borosilicate |
| Crystal System | Tetragonal | Trigonal |
| Mineral Class | 04 Oxides and Hydroxides | 09 Silicates |
| Mohs Hardness | 6.0-7.0 | 7.0-7.5 |
| Color | Brown, black, reddish-brown, yellow | Black, green, pink, blue, watermelon |
| Luster | Adamantine | Vitreous |
| Streak | White to pale brown | Colorless |
| Transparency | Translucent | Transparent |
| Cleavage | Poor {100} | None |
| Fracture | Subconchoidal to uneven | Conchoidal to uneven |