Amphibole
Amphibole is a mineral with the chemical formula Ca2(Mg,Fe)5Si8O22(OH)2. It has a Mohs hardness of 5-6 and glass to silky luster.
Amphibole properties
| Type | Mineral |
|---|---|
| Chemical formula | Ca2(Mg,Fe)5Si8O22(OH)2 |
| Mohs hardness | 5-6 |
| Luster | Glass to silky |
| Typical colors | Green, black, brown, and blue |
| Formation | Commonly forms in metamorphic rocks and as a component of igneous rocks |
| Rarity | 4 / 10 |
Mohs hardness 5–6 — fairly hard
1 · Talc5 · Apatite10 · Diamond
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