Ruby
Ruby is a gemstone with the chemical formula Al2O3:Cr. It has a Mohs hardness of 9 and vitreous luster.
Ruby properties
| Type | Gemstone |
|---|---|
| Chemical formula | Al2O3:Cr |
| Mohs hardness | 9 |
| Luster | Vitreous |
| Typical colors | Red, with possible shades of pink to purplish |
| Formation | Metamorphic and igneous processes, often found in marble and in basaltic rocks |
| Rarity | 8 / 10 |
Mohs hardness 9 — hard
1 · Talc5 · Apatite10 · Diamond
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