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Category Selenide mineral
(repeating unit)
Strunz classification 2.CC.05
Crystal system Hexagonal
Dihexagonal dipyramidal class
Unit cell a = 3.636, c = 5.946 [Å], Z = 2
Formula mass 134.81 g/mol
Color Dark grey
Crystal symmetry Hexagonal
H-M symbol: (6/m 2/m 2/m)
Space group: P63/mmc
Mohs scale hardness 2.5
Luster Metallic
Streak Grey-black
Diaphaneity Opaque
Specific gravity 6.53
References [1][2]

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]


  1. ^ a b Mindat Profile
  2. ^ a b Achavalite data on WebMineral
  3. ^ 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