Azurite vs Corundum
| Property | Azurite | Corundum |
|---|---|---|
| Formula | Cu3(CO3)2(OH)2 | Al2O3 |
| Crystal System | Monoclinic | Trigonal |
| Mineral Class | 05 Carbonates and Nitrates | 04 Oxides and Hydroxides |
| Mohs Hardness | 3.5-4.0 | 9.0 |
| Color | Azure blue, dark blue | Red (ruby), blue (sapphire), various colors |
| Luster | Vitreous | Adamantine |
| Streak | Light blue | Colorless |
| Transparency | Transparent | Transparent |
| Cleavage | Perfect {011}, fair {100} | None |
| Fracture | Conchoidal | Conchoidal to uneven |