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Mackinawite

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Kirovskii apatite mine (Kirovsky Mine; Kirovskii Mine; Kirov Mine), Kukisvumchorr Mt, Khibiny Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
© Leon Hupperichs

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Formula:
(Fe,Ni)
 
9
S
 
8
System:TetragonalColour:Bronze, White Gray
Hardness:2½
Name:Named after the discovery locality
This page provides mineralogical data about Mackinawite.

Classification of Mackinawite

IMA status:Approved
Strunz 8th edition ID:2/B.17-10
Nickel-Strunz 10th (pending) edition ID:2.CC.25

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
C : With Ni, Fe, Co, PGE, etc.
Dana 7th edition ID:2.7.2.1
Dana 8th edition ID:2.7.2.1

2 : SULFIDES
7 : AmBnXp, with (m+n):p = 9:8
Hey's CIM Ref.:3.9.6

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

Type Locality:Mackinaw Mine (Weden Creek Mine), Monte Cristo, Monte Cristo District, Snohomish Co., Washington, USA
Year of Discovery:1962

Physical Properties of Mackinawite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Bronze, White Gray
Streak:Black
Hardness (Mohs):2½
Cleavage:Perfect
Perfect on the {001}
Density (calculated):4.17 g/cm3

Crystallography of Mackinawite

Crystal System:Tetragonal
Class (H-M):4/mmm (4/m 2/m 2/m) - Ditetragonal Dipyramidal
Space Group:P4/nmm {P4/n 21/m 2/m}
Cell Parameters:a = 3.67Å, c = 5.03Å
Ratio:a:c = 1 : 1.371
Unit Cell Volume:V 68 ų
Z:2

Chemical Properties of Mackinawite

Formula:
(Fe,Ni)
 
9
S
 
8
Essential elements:Fe, S
All elements listed in formula:Fe, Ni, S
Common Impurities:Co,Cu,Ni

Relationship of Mackinawite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.CC.UM2007-26-S:CuFeIrNiPtRh
(Ir,Cu,Ni,Pt,Rh,Fe)
 
9
S
 
11
2.CC.05Achavalite
(Fe,Cu)Se
2.CC.05Breithauptite
NiSb
2.CC.05Freboldite
CoSe
2.CC.05Kotulskite
Pd(Te,Bi)
 
1-2
2.CC.05Langisite
(Co,Ni)As
2.CC.05Nickeline
NiAs
2.CC.05Sederholmite
beta-NiSe
2.CC.05Sobolevskite
PdBi
2.CC.05Stumpflite
Pt(Sb,Bi)
2.CC.05Sudburyite
(Pd,Ni)Sb
2.CC.05Jaipurite
CoS
2.CC.05Zlatogorite
NiCuSb
 
2
2.CC.10Pyrrhotite
Fe
 
1-x
S (x = 0 to 0.17)
2.CC.10Smythite
(Fe,Ni)
 
3+x
S
 
4
 (x=0-0.3)
2.CC.10Troilite
FeS
2.CC.15Cherepanovite
RhAs
2.CC.15Modderite
(Co,Fe)As
2.CC.15Ruthenarsenite
(Ru,Ni)As
2.CC.15Westerveldite
(Fe,Ni,Co)As
2.CC.20Millerite
NiS
2.CC.20Mäkinenite
γ-NiSe
2.CC.20UM1990-38-S:CuFeIrNiPtRh
(Ir,Pt,Ni,Fe)S
2.CC.30Hexatestibiopanickelite
(Pd,Ni)(Sb,Te)
2.CC.30Vavřínite
Ni
 
2
SbTe
 
2
2.CC.35aBraggite
(Pt,Pd,Ni)S
2.CC.35bCooperite
PtS
2.CC.35aVysotskite
(Pd,Ni)S
Related Minerals - Hey's Index Grouping:

- +
3.9.1Pyrrhotite
Fe
 
1-x
S (x = 0 to 0.17)
3.9.3Pyrite
FeS
 
2
3.9.4Marcasite
FeS
 
2
3.9.5Greigite
Fe
2+
 
Fe
3+
2
S
 
4
3.9.7Smythite
(Fe,Ni)
 
3+x
S
 
4
 (x=0-0.3)
3.9.8Achavalite
(Fe,Cu)Se
3.9.9Ferroselite
FeSe
 
2
3.9.10Frohbergite
FeTe
 
2
3.9.11Löllingite
FeAs
 
2
3.9.12Arsenopyrite
FeAsS
3.9.13Gudmundite
FeSbS

Other Names for Mackinawite

Other Languages:
German:Mackinawit
Russian:Макинавит
Simplified Chinese:马基诺矿
四方硫铁矿
Spanish:Mackinawita

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 Mackinawite

Reference List:

- +
American Mineralogist (1963): 48: 215.

Chemie die Erde (1981): 40: 237.

European Journal of Mineralogy: 6: 265-278.

American Mineralogist (1995): 80: 188.

United States Geological Service PP 475-D: D64-D69.

Mineralogical Magazine (1995): 59: 677-683.

Wolthers, M., Van Der Gaast, S.J., and Rickard, D. (2003) The structure of disordered mackinawite.American Mineralogist: 88: 2007-2015.

Wolthers, M., Charlet, L., Van Der Linde, P.R., Rickard, D., and Vamn Der Weijden, C.H. (2005) Surface chemistry of disordered mackinawite (FeS). Geochemica et Cosmochimica Acta: 69: 3469-3481.

Internet Links for Mackinawite

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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Mackinawite details from Handbook of Mineralogy (PDF)
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    • Localities for Mackinawite

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    New Locality Added: Italian Gully, Enfield, Victoria, AustraliaFrom Steve Sorrell, 20th May 2013 10:48:32