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Nickelskutterudite

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Formula:
NiAs
 
2-3
System:IsometricColour:Tin white - silver grey
Hardness:5½ - 6
Name:As the nickel member of skutterudite series.

Classification of Nickelskutterudite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/D.29-20
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:2.12.17.2

2 : SULFIDES
12 : AmBnXp, with (m+n):p = 1:2
Hey's CIM Ref.: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
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Type Occurrence of Nickelskutterudite

Type Locality:Schneeberg District, Erzgebirge, Saxony, Germany
Year of Discovery:1845

Physical Properties of Nickelskutterudite

Lustre: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 (measured):6.5 g/cm3
Density (calculated):5.97(90) g/cm3

Crystallography of Nickelskutterudite

Crystal System:Isometric
Class (H-M):m3 (2/m 3) - Diploidal
Space Group:Im3 {I2/m 3}
Cell Parameters:a = 8.17Å
Unit Cell Volume:V 545.34 ų (Calculated from Unit Cell)
Z:8
Morphology:Cubes, octahedrons and dodecahedron
Twinning:On {112} as sixlings

Optical Data of Nickelskutterudite

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

Chemical Properties of Nickelskutterudite

Formula:
NiAs
 
2-3
Simplified for copy/paste:NiAs2-3
Essential elements:As, Ni
All elements listed in formula:As, Ni
Common Impurities:Fe,Bi,S

Relationship of Nickelskutterudite to other Species

Series:Forms a series with Skutterudite (see here)
Structurally related to group(s):
Skutterudite Group
Related Minerals - Nickel-Strunz Grouping):

- +
2.EC.05Kieftite
CoSb
 
3
2.EC.05Skutterudite
(Co,Fe,Ni)As
 
2-3
2.EC.05Ferroskutterudite
(Fe,Co)As
 
3
2.EC.10Patrónite
VS
 
4
Related Minerals - Hey's Index Grouping:

- +
3.11.1Heazlewoodite
Ni
 
3
S
 
2
3.11.2Godlevskite
(Ni,Fe)
 
9
S
 
8
3.11.3Millerite
NiS
3.11.4Polydymite
Ni
2+
 
Ni
3+
2
S
 
4
3.11.5Vaesite
NiS
 
2
3.11.6Shandite
Ni
 
3
Pb
 
2
S
 
2
3.11.7Donharrisite
Ni
 
8
Hg
 
3
S
 
9
3.11.8Violarite
Fe
2+
 
Ni
3+
2
S
 
4
3.11.9Pentlandite
(Fe,Ni)
 
9
S
 
8
3.11.10Bravoite
(Fe,Ni)S
 
2
3.11.11Siegenite
CoNi
 
2
S
 
4
-NiCo
 
2
S
 
4
3.11.12Fletcherite
Cu(Ni,Co)
 
2
S
 
4
3.11.13Villamaninite
(Cu,Ni,Co,Fe)S
 
2
3.11.14Mäkinenite
γ-NiSe
3.11.15Sederholmite
beta-NiSe
3.11.16Trüstedtite
Ni
 
3
Se
 
4
3.11.17Wilkmanite
Ni
 
3
Se
 
4
3.11.18Kullerudite
NiSe
 
2
3.11.19Penroseite
(Ni,Co,Cu)Se
 
2
3.11.20Tyrrellite
Cu(Co
3+
 
,Ni
3+
 
)
 
2
Se
 
4
3.11.21Imgreite
NiTe (?)
3.11.22Melonite
NiTe
 
2
3.11.23Kitkaite
NiTeSe
3.11.24Dienerite
3.11.25Orcelite
Ni
 
5-x
As
 
2
3.11.26Maucherite
Ni
 
11
As
 
8
3.11.27Nickeline
NiAs
3.11.28Rammelsbergite
NiAs
 
2
3.11.29Pararammelsbergite
NiAs
 
2
3.11.31Oregonite
Ni
 
2
FeAs
 
2
3.11.32Westerveldite
(Fe,Ni,Co)As
3.11.33Langisite
(Co,Ni)As
3.11.34Gersdorffite
NiAsS
3.11.35Jolliffeite
NiAsSe
3.11.36Breithauptite
NiSb
3.11.38Ullmannite
NiSbS
3.11.39Willyamite
(Co,Ni)SbS

Other Names for Nickelskutterudite

Synonyms:
Ni Skutterudite
Other Languages:
German:Nickel-Skutterudit
Nickelskutterudit
Ni-Skutterudit
Ni Skutterudit
Russian:Никельскуттерудит
Simplified Chinese:镍砷钴矿
Varieties:
ChathamiteChloanthite

Other Information

Health Warning: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.

Internet Links for Nickelskutterudite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Nickel-Skutterudite details from Handbook of Mineralogy (PDF)
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