Achavalite
| Achavalite | |
|---|---|
| General | |
| Category | Selenide mineral |
| Formula (repeating unit) | (Fe,Cu)Se |
| Strunz classification | 02.CC.05 |
| Crystal symmetry |
Hexagonal dihexagonal dipyramidal H-M symbol: (6/m2/m2/m) Space group: P 63/mmc |
| Unit cell |
a = 3.636 Å, c = 5.946 Å, Z = 2 |
| Identification | |
| Formula mass | 134.81 g |
| Color | Dark grey |
| Crystal system | Hexagonal |
| Mohs scale hardness | 2.5 |
| Luster | Metallic |
| Streak | Grey-black |
| Diaphaneity | Opaque |
| Specific gravity | 6.53 |
| References | [1][2] |
Achavalite 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]