Achávalite
Achávalite is a selenide mineral that is a member of the nickeline group. It has only been found in a single Argentinian mine system, being first discovered in 1939 in a selenide deposit. The type locality is Cacheuta mine, Sierra de Cacheuta, Mendoza, Argentina.[1][2][3]
| Achávalite | |
|---|---|
 Black metallic crystals of achavalite from Cacheuta Mine, Mendoza, Argentina | |
| General | |
| Category | Selenide mineral |
| Formula (repeating unit) | (Fe,Cu)Se |
| Strunz classification | 2.CC.05 |
| 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 = 3.636, c = 5.946 [Å], Z = 2 |
| Identification | |
| Formula mass | 134.81 g/mol |
| Color | Dark grey |
| Mohs scale hardness | 2.5 |
| Luster | Metallic |
| Streak | Grey-black |
| Diaphaneity | Opaque |
| Specific gravity | 6.53 |
| References | [1][2] |
References
- Mindat Profile
- Achavalite data on WebMineral
- Hålenius, U., Hatert, F., Pasero, M., and Mills, S.J., IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) Newsletter 28. Mineralogical Magazine 79(7), 1859–1864
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