Amazonite vs Corundum
| Property | Amazonite | Corundum |
|---|---|---|
| Formula | KAlSi3O8 | Al2O3 |
| Crystal System | Triclinic | Trigonal |
| Mineral Class | 09 Silicates | 04 Oxides and Hydroxides |
| Mohs Hardness | 6.0-6.5 | 9.0 |
| Color | Green, blue-green | Red (ruby), blue (sapphire), various colors |
| Luster | Vitreous | Adamantine |
| Streak | White | Colorless |
| Transparency | Translucent | Transparent |
| Cleavage | Perfect {001}, good {010} | None |
| Fracture | Conchoidal to uneven | Conchoidal to uneven |