Calcite vs Tourmaline
| Property | Calcite | Tourmaline |
|---|---|---|
| Formula | CaCO3 | Complex borosilicate |
| Crystal System | Trigonal | Trigonal |
| Mineral Class | 05 Carbonates and Nitrates | 09 Silicates |
| Mohs Hardness | 3.0 | 7.0-7.5 |
| Color | Colorless, white, yellow, orange, blue, green | Black, green, pink, blue, watermelon |
| Luster | Vitreous | Vitreous |
| Streak | White | Colorless |
| Transparency | Transparent | Transparent |
| Cleavage | Perfect rhombohedral {1011} | None |
| Fracture | Conchoidal | Conchoidal to uneven |