Mineral description : Domeykite

Mineral class Sulphides : Chalcocite group

Chemical formula Cu₃As

Crystal system Cubic

Habitus Reniform, botryodal and massive.

Cleavage Fracture uneven.

Hardness 3 - 3.5

Density 7.2 - 7.9

Color Tin white to steel gray. Tarnishes from yellowish over brown to iridescence.

Streak

Luster Metallic, opaque.

Description

Occurance In hydrothermal veins.

Associates Silver, algodonite.

Notes Named after the Chilean mineralogist Ignacio Domeyko (1802 - 1889).
(Maybe it should be Polish-Chilean according to an anonymous mail)

Localities A rare mineral.
Sweden :

Långban, Värmland. In fractures in hematite impregnated dolomite with pyroaurit and pyrochroite.
Not known from Norway. Finland : waiting for data.

To sulphides index.
Mineral group index.
Main index.

If you have some questions, suggestions or comments you are welcome to write me a line or two.

axelsson@acc.umu.se

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Last changed : 2004-04-07

Mineral class	Sulphides : Chalcocite group
Chemical formula	Cu₃As
Crystal system	Cubic
Habitus	Reniform, botryodal and massive.
Cleavage	Fracture uneven.
Hardness	3 - 3.5
Density	7.2 - 7.9
Color	Tin white to steel gray. Tarnishes from yellowish over brown to iridescence.
Streak
Luster	Metallic, opaque.
Description
Occurance	In hydrothermal veins.
Associates	Silver, algodonite.
Notes	Named after the Chilean mineralogist Ignacio Domeyko (1802 - 1889). (Maybe it should be Polish-Chilean according to an anonymous mail)
Localities	A rare mineral. Sweden : Långban, Värmland. In fractures in hematite impregnated dolomite with pyroaurit and pyrochroite. Not known from Norway. Finland : waiting for data.