Onyx
Onyx is a gemstone with the chemical formula SiO2 (with impurities). It has a Mohs hardness of 6.5 - 7 and waxy to dull luster.
Onyx properties
| Type | Gemstone |
|---|---|
| Chemical formula | SiO2 (with impurities) |
| Mohs hardness | 6.5 - 7 |
| Luster | Waxy to dull |
| Typical colors | Typically black and white; can also be found in shades of brown, red, and green |
| Formation | Formed from the layering of silica and is often found in volcanic rocks |
| Rarity | 6 / 10 |
Mohs hardness 6.5–7 — hard
1 · Talc5 · Apatite10 · Diamond
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