Goethite
Goethite is a mineral with the chemical formula FeO(OH). It has a Mohs hardness of 5 - 5.5 and submetallic to dull luster.
Goethite properties
| Type | Mineral |
|---|---|
| Chemical formula | FeO(OH) |
| Mohs hardness | 5 - 5.5 |
| Luster | Submetallic to dull |
| Typical colors | Yellowish-brown to brown, black |
| Formation | Typically forms in oxidized zones of iron-rich deposits |
| Rarity | 4 / 10 |
Mohs hardness 5–5.5 — medium
1 · Talc5 · Apatite10 · Diamond
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