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Skutterudite

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Formula:
CoAs3
Also given as (Co,Fe,Ni)As2-3.
Colour:
Tin-white to silver-gray, gray (tarnished)
Lustre:
Metallic
Hardness:
5½ - 6
Specific Gravity:
6.5
Crystal System:
Isometric
Name:
Named in 1845 by Wilhelm Karl von Haidinger after its discovery locality, Skutterud, Modum, Norway.

The earliest name that possibly refers to any skutterudite-like material, cobaltum eineraceum, was introduced by Georgius Agricola in 1529. Wallerius used several names for a skutterudite-like mineral (kobaltglants, kobaltmalm, minera cobalti cinerea, cobaltum arsenico mineralisatum). Named speiskobalt by Werner (see Hausmann, 1813), but also seemingly equally applied to safflorite and smaltite. Arsenikkobaltkies was used by Karl Johann August Theodor Scheerer for Norwegian skutterudite in 1837 and Arsenikkobalt was used in 1852 by Gustav Rose.
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Classification of SkutteruditeHide

Approved, 'Grandfathered' (first described prior to 1959)
Approval History:
Chemical formula revised by the IMA in January 2017.
2.EC.05

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
E : Metal Sulfides, M: S <= 1:2
C : M:S = 1:>2
2.12.17.1

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
3.10.12

3 : Sulphides, Selenides, Tellurides, Arsenides and Bismuthides (except the arsenides, antimonides and bismuthides of Cu, Ag and Au, which are included in Section 1)
10 : Sulphides etc. of Co

Pronounciation of SkutteruditeHide

Pronounciation:
PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of SkutteruditeHide

Metallic
Transparency:
Opaque
Colour:
Tin-white to silver-gray, gray (tarnished)
Streak:
Black
Hardness:
5½ - 6 on Mohs scale
Hardness:
VHN100=810 - 915 kg/mm2 - Vickers
Cleavage:
Distinct/Good
Distinct on {001}{111} in traces on {011}
Fracture:
Irregular/Uneven, Conchoidal
Density:
6.5 g/cm3 (Measured)    6.821 g/cm3 (Calculated)

Chemical Properties of SkutteruditeHide

Formula:
CoAs3

Also given as (Co,Fe,Ni)As2-3.
Common Impurities:
S,Bi,Cu,Pb,Zn,Ag,Fe,Ni

Crystallography of SkutteruditeHide

Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Im3
Cell Parameters:
a = 8.204 Å
Unit Cell V:
552.18 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Cubic crystals
Twinning:
On {112} as sixlings, reported on {011}

Crystallographic forms of SkutteruditeHide

Crystal Atlas:
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Skutterudite no.1 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

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X-Ray Powder DiffractionHide

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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Type Occurrence of SkutteruditeHide

Synonyms of SkutteruditeHide

Other Language Names for SkutteruditeHide

Relationship of Skutterudite to other SpeciesHide

Other Members of this group:
Ferroskutterudite(Fe,Co)As3Iso. m3m (4/m 3 2/m) : Im3m
KieftiteCoSb3Iso.
Nickelskutterudite(Ni,Co,Fe)As3Iso. m3 (2/m 3) : Im3
Forms a series with:

Common AssociatesHide

Associated Minerals Based on Photo Data:
Erythrite50 photos of Skutterudite associated with Erythrite on mindat.org.
Calcite37 photos of Skutterudite associated with Calcite on mindat.org.
Safflorite35 photos of Skutterudite associated with Safflorite on mindat.org.
Nickeline23 photos of Skutterudite associated with Nickeline on mindat.org.
Silver23 photos of Skutterudite associated with Silver on mindat.org.
Quartz17 photos of Skutterudite associated with Quartz on mindat.org.
Bismuth10 photos of Skutterudite associated with Bismuth on mindat.org.
Arsenopyrite7 photos of Skutterudite associated with Arsenopyrite on mindat.org.
Gersdorffite7 photos of Skutterudite associated with Gersdorffite on mindat.org.
Proustite6 photos of Skutterudite associated with Proustite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.EC.05KieftiteCoSb3Iso.
2.EC.05Nickelskutterudite(Ni,Co,Fe)As3Iso. m3 (2/m 3) : Im3
2.EC.05Ferroskutterudite(Fe,Co)As3Iso. m3m (4/m 3 2/m) : Im3m
2.EC.10PatróniteVS4Mon.

Related Minerals - Dana Grouping (8th Ed.)Hide

2.12.17.2Nickelskutterudite(Ni,Co,Fe)As3Iso. m3 (2/m 3) : Im3
2.12.17.3KieftiteCoSb3Iso.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.10.1Cobaltpentlandite(Co,Ni,Fe)9S8Iso. m3m (4/m 3 2/m) : Fm3m
3.10.2LinnaeiteCo2+Co3+2S4Iso.
3.10.3CattieriteCoS2Iso. m3 (2/m 3) : Pa3
3.10.4FrebolditeCoSeHex. 6/mmm (6/m 2/m 2/m) : P63/mmc
3.10.5BornhardtiteCo2+Co3+2Se4Iso. m3m (4/m 3 2/m) : Fd3m
3.10.6TrogtaliteCoSe2
3.10.7HastiteFeSe2Orth.
3.10.8MattagamiteCoTe2Orth.
3.10.9Modderite(Co,Fe)AsOrth.
3.10.10Safflorite(Co,Ni,Fe)As2Orth. mmm (2/m 2/m 2/m) : Pnnm
3.10.11ClinosaffloriteCoAs2Mon. 2/m : P21/m
3.10.13CobaltiteCoAsSOrth. mm2 : Pca21
3.10.14ParacostibiteCoSbSOrth.
3.10.15CostibiteCoSbSOrth. mm2 : Pmn21
3.10.16AlloclasiteCo1-xFexAsSMon. 2 : P21
3.10.17Glaucodot(Co0.50Fe0.50)AsSOrth. mm2 : Pmn21
3.10.18CarrolliteCu(Co,Ni)2S4Iso. m3m (4/m 3 2/m) : Fd3m

Other InformationHide

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Skutterudite in petrologyHide

Common component of (items highlighted in red)

References for SkutteruditeHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Georgius Agricola (1529).
Wallerius.
Werner.
Hausmann (1813).
Breithaupt, A. (1827) Ueber eine neue Kies-Spezies von Skutterud. Annalen der Physik und Chemie 9: 115-116 [Tesseralkies, Hartkobaltkies].
Scheerer, T. (1837) Ueber zwei norwegische Kobalterze von den Skutteruder Gruben. Annalen der Physik und Chemie 42: 546-555. [Arsenik-kobaltkies].
Hausmann, J. F. L. (1847) Handbuch der Mineralogie. Zweiter Theil. System und Geschichte der Mineralkörper, 2nd edition. p. 69. [Hartkobalterz].
Haidinger, W. (1845) Handbuch der bestimmenden Mineralogie, enthaltend die Terminologie, Systematik, Nomenklatur und Charakteristik der Naturgeschichte des Mineralreiches, 650 pp. Braumüller & Seidel, Wien, p. 560. [Skutterudit].
Nicol, J. (1849) Manual of Mineralogy or the Natural History of the Mineral Kingdom. Adam and Black, Edinburg, p. 457. [Modumite].
Samdahl, B. (1925) Analyse der Skutterudits. Norsk Geologisk Tidsskrift. 8, 63-73.
Oftedal, I. (1926) The crystal structure of skutterudite and related minerals. A preliminary paper. Norsk Geologisk Tidsskrift 8: 250-257 + plate.
Oftedal, I. (1928) Die Kristallstruktur von Skutterudit und Speiskobalt-Chloanthit. Zeitschrift für Kristallographie 66: 517-546.
Palache, Charles, Harry Berman & Clifford Frondel (1944) The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 342-347.
Holmes, R.J., (1947) Higher mineral arsenides of cobalt, nickel, and iron. Bulletin of the Geological Society of America: 58: 299-392.
Roseboom, E.H. (1962) Skutterudites (Co,Ni,Fe)As3-x: Composition and cell dimensions. American Mineralogist, 47, 310-327.
Klemm, D.D. (1965) Untersuchungen mit der Elektronenmikrosonde über die natürlichen Mischkristallbereiche der Skutterudite. Contributions to Mineralogy and Petrology 11, 323-333.
Radcliffe, D. (1968) Structural formula and composition of skutterudite. Can. Mineral. 9, 559-563.
Canadian Mineralogist (1971) 9: 559.
Acta Crystallographica: B27: 2288-2289.
CNMNC Newsletter No. 35, February 2017.

Internet Links for SkutteruditeHide

Localities for SkutteruditeHide

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListShow

Mineral and/or Locality  
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