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Minerals - Skutterudite | TerraCollect

Mineral - Skutterudite

SkutteruditeCoAs₃

Chemical Properties

Mineral Class

Sulfides and sulfosalts

Toxicity

middle

Formula

CoAs₃

Unit Cell

a=8.20 Z=8

Physical Properties

Hardness

5.5 - 6

Streak

black

Density

Very Heavy (>6)

Optical Properties

Color

graysilver

Birefringence

Luster

Metallic

Transparency

opaque

Pleochroism

Geomineralogical Properties

Crystal System

isometric

Point Group

Composition

Elements

Mass

Co

19.70

Fe

2.80

As

76.41

S

1.03

Norway (Palache et al. 1952)

Groups and Members

Perovskite-Group

Skutterudite-Subgroup

Karten-Ebenen

Geologische KarteSatelliten Karte

Cleavage

Distinct after {001} and {111}

Fracture

conchoidal,

uneven

Tenacity

Brittle

diploidal - 2/m 3

Space Group

Im3 (204)

Habit

dendritic, dodecahedron, massive, Octahedron, Cube

Formation

(1) Primary hydrothermal in medium- to high-temperature veins. (2) Metamorphic-metasomatic through mobilization and recrystallization in arsenic-bearing sulfide deposits under granulite- to amphibolite-facies conditions.

Paragenesis

Twinning

Rotational twins after {112} - Sixlings

Rarity

Rarely

Synonyms

Skutterudite