Corundum vs Fluorite
| Property | Corundum | Fluorite |
|---|---|---|
| Formula | Al2O3 | CaF2 |
| Crystal System | Trigonal | Cubic (Isometric) |
| Mineral Class | 04 Oxides and Hydroxides | 03 Halides |
| Mohs Hardness | 9.0 | 4.0 |
| Color | Red (ruby), blue (sapphire), various colors | Purple, blue, green, yellow, colorless, pink |
| Luster | Adamantine | Vitreous |
| Streak | Colorless | White |
| Transparency | Transparent | Transparent |
| Cleavage | None | Perfect octahedral {111} |
| Fracture | Conchoidal to uneven | Conchoidal |