Minerals identify

Know how to recognize them

Skutterudite

Arsenide mineral

Named after Skuterudåsen, a hill in Modum , skutterudite is a cobalt containing variable amounts of nickel substituting for cobalt with the ideal formula CoAs3. Some references give the arsenic a variable formula subscript of 2-3. High nickel varieties are referred to as nickel-skutterudite, previously chloanthite. It is a hydrothermal mineral found in moderate to high temperature veins with other Ni-Co minerals. Associated minerals are arsenopyrite, annabergite, silver sulfosalts , siderite It is mined as an ore of cobalt and nickel with a by-product of arsenic.

The crystal structure of this mineral has been found to be exhibited by several compounds with important technological uses.

The mineral has a bright metallic luster, and is tin white or light steel gray in color with a black streak. The specific gravity is 6.5 and the hardness is 5.5–6. Its crystal structure with cube and octahedron forms similar to that of pyrite. The arsenic content gives a garlic odor when heated or crushed.

Skutterudite was discovered in Skuterud Mines, Modum , Buskerud Smaltite is an alternative name for the mineral. Notable occurrences include Cobalt, Ontario , and Franklin, New Jersey. The rare arsenide minerals are classified in Dana's sulfide mineral group, even though it contains no sulfur.

Identification

Color of mineral

Silver
White
Grey
Golden

Mohs scale ( mineral hardness )

5.5

Luster ( interacts light )

Metallic

Crystal ( diaphaneity )

Cubic