Achavalite

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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]

References[edit]