Mineral Information and Data:

Skutterudite
CoAs3-x [CNMNC approved formula]

Named after the locality: Skutterud, Norway.

IMA status : Valid species (Pre-IMA 1845) Grandfathered
CLASSIFICATION 
Dana
(8th edition) :
02.12.17.01  
  (02) Sulfides - Including Selenides and Tellurides
  (02.12) where Am Bn Xp, with (m+n):p=1:2
  (02.12.17) Skutterudite Series
  
Nickel-Strunz
(10th edition) :
02.EC.05
  (02) Sulfides
  (02.E) Metal Sulfides, M:S = 1:2
  (02.EC) M:S = 1:>2
  
Crystal system: Cubic System
Point group (H-M): m3 (or 2/m 3) — diploidal
Unit cell: a = 8.204 Å
Crystal Habit: Crystals cubic, octahedral, cubo-octahedral, rarely pyritohedral, reticulated shapes, distorted aggregates, massive
Twinning: On {112} sixlings, also on {011}
  
Color: Tin-white, may tarnish iridescent or gray
Diaphaneity: Opaque
Luster: Metallic
Hardness (Mohs): 5.5 to 6
Measured Density: 6.1 to 6.9 g/cm3
Cleavage: 3; {001} and {111} distinct, {011} trace
Fracture: Conchoidal to uneven
Streak: Black
  
Polymorphism and Series: Forms a series with nickel-skutterudite
Geologic Setting: Typically in medium- to high-temperature hydrothermal veins with other Ni–Co
sulfide minerals.
Mineral Association: Nickeline, cobaltite, arsenopyrite, silver, silver sulfosalts, bismuth, calcite, siderite, barite, quartz
  
Synonyms/varieties: Smaltite (As-poor variety)

 

Skutterudite
Origin: Bou Azzer, Anti-Atlas Mts, Morocco
Sample size: Microscopic image
Photo and Owner: Lou Perloff

 

Skutterudite
Origin: Bou Azzer, Morocco
Sample size: 2.5 x 2.5 x 4 cm
Photo: Dan Weinrich

 

Skutterudite
(zoom-in of above)

 

Skutterudite
Origin: Cobalt, Ontario, Canada
Sample size: 4 x 5 x 5 cm
Photo: Tom Loomis

 

Skutterudite
(zoom-in of above)

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