Corundum vs Tourmaline
| Property | Corundum | Tourmaline |
|---|---|---|
| Fórmula | Al2O3 | Complex borosilicate |
| Sistema Cristalino | Trigonal | Trigonal |
| Clase Mineral | 04 Oxides and Hydroxides | 09 Silicates |
| Dureza Mohs | 9.0 | 7.0-7.5 |
| Color | Red (ruby), blue (sapphire), various colors | Black, green, pink, blue, watermelon |
| Brillo | Adamantine | Vitreous |
| Raya | Colorless | Colorless |
| Transparencia | Transparent | Transparent |
| Exfoliación | None | None |
| Fractura | Conchoidal to uneven | Conchoidal to uneven |