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.^[2][3][4]

Achávalite
Black metallic crystals of achávalite from Cacheuta Mine, Mendoza, Argentina
General
Category	Selenide mineral
Formula	(Fe,Cu)Se
IMA symbol	Ahv[1]
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	[2][3]

See also

• List of minerals