Mineral description : Skutterudite

Picture pending, skutterudite crystal from Morocco.

Mineral class Sulphides : Nickeline cobaltine skutterudite group

Chemical formula (Co,Ni)As₃

Crystal system Cubic

Habitus Cubic rounded crystals. Massive.

Cleavage [100] distinct, [111] distinct.

Hardness 6

Density 6.8

Color Silvery grayish to steel gray, opaque.

Streak Black.

Luster Metallic.

Description

Occurance

Associates Erythrite, Annabergite.

Notes Type locality : Skutterud, Modum, Norway.
Often covered in a crust of green annabergite and red erythrite.
Forms a substitution serie with smaltite (more nickel) and chloantite (more iron).

Localities A rare mineral in Sweden.

Ålberga, Södermanland. As small crystals or massive.
Los, Hälsingland.
Vena, Askersund, Närke.
Sikforsgruvan, Hällefors.
Tunaberg, Nyköping, Södermanland.
Skellefteå mining district (Boliden, Lainijaur, Laver, Lindströmsgruvan).

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axelsson@acc.umu.se

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Last changed : 2000-06-12

Mineral class	Sulphides : Nickeline cobaltine skutterudite group
Chemical formula	(Co,Ni)As₃
Crystal system	Cubic
Habitus	Cubic rounded crystals. Massive.
Cleavage	[100] distinct, [111] distinct.
Hardness	6
Density	6.8
Color	Silvery grayish to steel gray, opaque.
Streak	Black.
Luster	Metallic.
Description
Occurance
Associates	Erythrite, Annabergite.
Notes	Type locality : Skutterud, Modum, Norway. Often covered in a crust of green annabergite and red erythrite. Forms a substitution serie with smaltite (more nickel) and chloantite (more iron).
Localities	A rare mineral in Sweden. Ålberga, Södermanland. As small crystals or massive. Los, Hälsingland. Vena, Askersund, Närke. Sikforsgruvan, Hällefors. Tunaberg, Nyköping, Södermanland. Skellefteå mining district (Boliden, Lainijaur, Laver, Lindströmsgruvan).