Algodonite
Algodonite is a copper arsenide mineral with formula: Cu6As. It is a gray white metallic mineral crystallizing in the hexagonal system. It has a Mohs hardness of 4 and a specific gravity of 8.38 – 8.72.
| Algodonite | |
|---|---|
Algodonite – Houghton County, Michigan, US | |
| General | |
| Category | Sulfide mineral |
| Formula (repeating unit) | Cu6As |
| IMA symbol | Ago |
| Strunz classification | 2.AA.10a |
| Crystal system | Hexagonal |
| Crystal class | Dihexagonal dipyramidal (6/mmm) H-M symbol: (6/m 2/m 2/m) |
| Space group | P63/mmc |
| Unit cell | a = 2.6, c = 4.228 [Å]; Z = 2 |
| Identification | |
| Formula mass | 456.2 g/mol |
| Color | Gray, silver white, steel gray, tarnishes dull bronze |
| Crystal habit | Massive, granular. Common texture observed in granite and other igneous rock |
| Fracture | Sub-conchoidal |
| Mohs scale hardness | 4 |
| Luster | Metallic |
| Diaphaneity | Opaque |
| Specific gravity | 8.38 (measured), 8.72 (calculated) |
| Other characteristics | Non-magnetic, non-fluorescent |
| References | |
It was first described in 1857 from the Algodones silver mine, Coquimbo, Chile.
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