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Nickelskutterudite

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Formula:
NiAs3-x
System:
Isometric
Colour:
Tin white - silver grey
Lustre:
Metallic
Hardness:
5½ - 6
Name:
As the nickel member of skutterudite series.

Classification of Nickelskutterudite

Approved, 'Grandfathered' (first described prior to 1959)
Approval History:
Chemical formula revised by IMA jan 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
2.12.17.2

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
3.11.30

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

Physical Properties of Nickelskutterudite

Metallic
Diaphaneity (Transparency):
Opaque
Colour:
Tin white - silver grey
Comment:
Tarnising gray to iridescent
Streak:
Black
Hardness (Mohs):
5½ - 6
Cleavage:
Distinct/Good
Distinct on {001}{111}, traces on {011}
Fracture:
Irregular/Uneven, Conchoidal
Density:
6.5 g/cm3 (Measured)    5.97(90) g/cm3 (Calculated)

Optical Data of Nickelskutterudite

Type:
Isotropic
Anisotropism:
Weak to distict
Colour in reflected light:
Light yellowish white, anisotropic zones reddish

Chemical Properties of Nickelskutterudite

IMA Formula:
NiAs3-x
Mindat.org Formula:
(Ni,Co,Fe)As3

Also given as NiAs2-3.
Elements listed in formula:
Common Impurities:
Fe,Bi,S

Crystallography of Nickelskutterudite

Crystal System:
Isometric
Class (H-M):
m3 (2/m 3) - Diploidal
Space Group:
Im3
Cell Parameters:
a = 8.2653(6) Å
Unit Cell Volume:
V 564.65 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Cubes, octahedra and dodecahedra.
Twinning:
On {112} as sixlings
Comment:
Space group Im-3. Also given: 8.17 Å.

Type Occurrence of Nickelskutterudite

Relationship of Nickelskutterudite to other Species

Series:
Forms a series with Skutterudite (see here)
Other Members of Group:
3.11.1HeazlewooditeNi3S2
3.11.2Godlevskite(Ni,Fe)9S8
3.11.3MilleriteNiS
3.11.4PolydymiteNi3S4
3.11.5VaesiteNiS2
3.11.6ShanditePb2Ni3S2
3.11.7DonharrisiteNi8Hg3S9
3.11.8ViolariteFe2+Ni23+S4
3.11.9Pentlandite(Ni,Fe)9S8
3.11.10Bravoite(Fe,Ni)S2
3.11.11SiegeniteCoNi2S4
3.11.12FletcheriteCuNi2S4
3.11.13VillamaniniteCuS2
3.11.14MäkineniteNiSe
3.11.15SederholmiteNiSe
3.11.16TrüstedtiteNi3Se4
3.11.17WilkmaniteNi3Se4
3.11.18KulleruditeNiSe2
3.11.19PenroseiteNiSe2
3.11.20Tyrrellite(Co,Cu,Ni)3Se4
3.11.21ImgreiteNiTe (?)
3.11.22MeloniteNiTe2
3.11.23KitkaiteNiTeSe
3.11.24Dienerite
3.11.25OrceliteNi5-xAs2 (x=0.23)
3.11.26MaucheriteNi11As8
3.11.27NickelineNiAs
3.11.28RammelsbergiteNiAs2
3.11.29PararammelsbergiteNiAs2
3.11.31OregoniteFeNi2As2
3.11.32WestervelditeFeAs
3.11.33LangisiteCoAs
3.11.34GersdorffiteNiAsS
3.11.35JolliffeiteNiAsSe
3.11.36BreithauptiteNiSb
3.11.38UllmanniteNiSbS
3.11.39WillyamiteCoSbS

Other Names for Nickelskutterudite

Other Information

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

References for Nickelskutterudite

Reference List:
Waller and Moses (1892), Sch. Mines Q.: 14: 49.

American Mineralogist (1943): 28: 63.

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. VOL. 58, PP. 299-392.

Roseboom, E.H. (1962): Skutterudites (Co,Ni,Fe)As3-x: Composition and cell dimensions. American Mineralogist, 47, 310-327.

Benjamin N. Schumer, Marcelo B. Andrade, Stanley H. Evans, Robert T. Downs (2017): A new formula and crystal structure for nickelskutterudite, (Ni,Co,Fe)As3, and occupancy of the icosahedral cation site in the skutterudite group. American Mineralogist, 102: 205-209.

CNMNC Newsletter No. 35

Internet Links for Nickelskutterudite

mindat.org URL:
https://www.mindat.org/min-2897.html
Please feel free to link to this page.
Specimens:
The following Nickelskutterudite specimens are currently listed for sale on minfind.com.

Localities for Nickelskutterudite

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