Mineral description : Koutekite

Mineral class Sulphides : Chalcocite group

Chemical formula Cu₅As₂

Crystal system Hexagonal

Habitus As fine grains or intergrown with other minerals.

Cleavage

Hardness 3.5 - 4

Density 8.48

Color Silvery gray, bluish gray when polished.

Streak Black.

Luster Metallic, opaque.

Description

Occurance In arsenic copper deposits.

Associates Arsenic, silver, skutterudite, löllingite, chalcocite, algodonite, domeykite, allargentum, kutinaite, paxite, calcite.

Notes Closely related to domeykite and algodonite.
Named after J. Koutek, professor of Economical Geology, Charles University, Prague, Czechoslovakia.

Localities A rare mineral
Sweden :

Harstigen, Pajsberg, Värmland
Långban, Värmland. Rare, in fractures together with calcite.
Not known from Norway. Finland : waiting for data.

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Last changed : 2000-10-17

Mineral class	Sulphides : Chalcocite group
Chemical formula	Cu₅As₂
Crystal system	Hexagonal
Habitus	As fine grains or intergrown with other minerals.
Cleavage
Hardness	3.5 - 4
Density	8.48
Color	Silvery gray, bluish gray when polished.
Streak	Black.
Luster	Metallic, opaque.
Description
Occurance	In arsenic copper deposits.
Associates	Arsenic, silver, skutterudite, löllingite, chalcocite, algodonite, domeykite, allargentum, kutinaite, paxite, calcite.
Notes	Closely related to domeykite and algodonite. Named after J. Koutek, professor of Economical Geology, Charles University, Prague, Czechoslovakia.
Localities	A rare mineral Sweden : Harstigen, Pajsberg, Värmland Långban, Värmland. Rare, in fractures together with calcite. Not known from Norway. Finland : waiting for data.