Chalcedony
Chalcedony is a gemstone with the chemical formula SiO2. It has a Mohs hardness of 6.5 - 7 and waxy to vitreous luster.
Chalcedony properties
| Type | Gemstone |
|---|---|
| Chemical formula | SiO2 |
| Mohs hardness | 6.5 - 7 |
| Luster | Waxy to vitreous |
| Typical colors | White, gray, blue, green, black, and various other shades |
| Formation | Formed from microcrystalline quartz in a wide range of geological environments |
| Rarity | 5 / 10 |
Mohs hardness 6.5–7 — hard
1 · Talc5 · Apatite10 · Diamond
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