Chert
Chert is a rock with the chemical formula SiO2. It has a Mohs hardness of 6.5 - 7 and subvitreous to dull luster.
Chert properties
| Type | Rock |
|---|---|
| Chemical formula | SiO2 |
| Mohs hardness | 6.5 - 7 |
| Luster | Subvitreous to dull |
| Typical colors | Gray, brown, red, green, black, and white |
| Formation | Formed from the accumulation of silica from organisms or precipitation in sedimentary environments |
| Rarity | 4 / 10 |
Mohs hardness 6.5–7 — hard
1 · Talc5 · Apatite10 · Diamond
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