Staurolite
Staurolite is a mineral with the chemical formula Fe2Al9Si4O22(OH)2. It has a Mohs hardness of 7.5 and vitreous to dull luster.
Staurolite properties
| Type | Mineral |
|---|---|
| Chemical formula | Fe2Al9Si4O22(OH)2 |
| Mohs hardness | 7.5 |
| Luster | Vitreous to dull |
| Typical colors | Brown, black, green, reddish-brown |
| Formation | Metamorphic rocks, particularly in schists and gneisses |
| Rarity | 6 / 10 |
Mohs hardness 7.5 — hard
1 · Talc5 · Apatite10 · Diamond
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