Corundum
Corundum is a mineral with the chemical formula Al2O3. It has a Mohs hardness of 9 (Mohs scale) and adamantine to vitreous luster.
Corundum properties
| Type | Mineral |
|---|---|
| Chemical formula | Al2O3 |
| Mohs hardness | 9 (Mohs scale) |
| Luster | Adamantine to vitreous |
| Typical colors | Colorless, blue, red (ruby), yellow, green, purple, and others |
| Formation | Typically forms in metamorphic rocks, igneous rocks, and as a result of hydrothermal processes |
| Rarity | 6 / 10 |
Mohs hardness 9 — hard
1 · Talc5 · Apatite10 · Diamond
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