Basalt
Basalt is a rock with the chemical formula SiO2. It has a Mohs hardness of 6-7 and vitreous to dull luster.
Basalt properties
| Type | Rock |
|---|---|
| Chemical formula | SiO2 |
| Mohs hardness | 6-7 |
| Luster | Vitreous to dull |
| Typical colors | Dark gray to black, sometimes with green or reddish hues |
| Formation | Igneous, formed from the rapid cooling of lava at or near the Earth's surface |
| Rarity | 4 / 10 |
Mohs hardness 6–7 — hard
1 · Talc5 · Apatite10 · Diamond
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