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Cubanite

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Formula:
CuFe
 
2
S
 
3
System:OrthorhombicColour:Brass to bronze-yellow
Lustre:MetallicHardness:
Name:After the type locality in the country of Cuba.
Dimorph of:Isocubanite


Very sensitive to temperature, pressure and compositional variations.
Between 200 and 210°C, cubanite transforms irreversibly to isocubanite (Cabri et al. 1973).

Unlike the other chemically similar, but much more common Cu-Fe-sulphide, chalcopyrite, cubanite is strongly magnetic.


Classification of Cubanite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/C.14-20
Nickel-Strunz 10th (pending) edition ID:2.CB.55a

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
B : With Zn, Fe, Cu, Ag, etc.
Dana 8th edition ID:2.9.13.1

2 : SULFIDES
9 : AmBnXp, with (m+n):p = 1:1
Hey's CIM Ref.:3.1.22

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

Type Locality:Barracanao (Baracoa), Moa-Baracoa District, Mayarí-Baracoa Belt, Holguín Province, Cuba
Year of Discovery:1843

Occurrences of Cubanite

Geological Setting:High temperature hydrothermal deposits

Physical Properties of Cubanite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Colour:Brass to bronze-yellow
Streak:Gray-black
Hardness (Mohs):
Parting:on {110} {130}
Fracture:Conchoidal
Density (measured):4.03 - 4.18 g/cm3
Density (calculated):4.076 g/cm3

Crystallography of Cubanite

Crystal System:Orthorhombic
Class (H-M):mmm (2/m 2/m 2/m) - Dipyramidal
Cell Parameters:a = 6.467(1) Å, b = 11.117(1) Å, c = 6.231(2) Å
Ratio:a:b:c = 0.582 : 1 : 0.56
Unit Cell Volume:V 447.97 ų (Calculated from Unit Cell)
Z:4
Morphology:Elongated, thick tabular
Twinning:Common on {110}
pairs, fourlings and sixlings.
Comment:Space group Pcmn (non-standard setting).
Crystal Atlas:
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Cubanite - {110}, {010}, {101}, modified
Cubanite - {100}, {110}, {001}, {011}, modified

About Crystal Atlas

The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. The 3d models and HTML5 code are kindly provided by www.smorf.nl.

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X-Ray Powder Diffraction:
d-spacingIntensity
3.49 (4)
3.22 (10)
3.00 (4)
2.79 (4)
1.867 (8)
1.750 (7)
1.165 (5)

Optical Data of Cubanite

Type:Anisotropic
Anisotropism:Distinctive

Chemical Properties of Cubanite

Formula:
CuFe
 
2
S
 
3
Simplified for copy/paste:CuFe2S3
Essential elements:Cu, Fe, S
All elements listed in formula:Cu, Fe, S

Relationship of Cubanite to other Species

Common Associates:
SphaleritePyrrhotitePyriteChalcopyrite
Related Minerals - Nickel-Strunz Grouping):

- +
2.CB.05aColoradoite
HgTe
2.CB.05aHawleyite
CdS
2.CB.05aMetacinnabar
HgS
2.CB.05cPolhemusite
(Zn,Hg)S
2.CB.05bSakuraiite
(Cu,Zn,Fe)
 
3
(In,Sn)S
 
4
2.CB.05aSphalerite
ZnS
2.CB.05aStilleite
ZnSe
2.CB.05aTiemannite
HgSe
2.CB.05UM1998-15-S:CuFeZn
Cu
 
2
Fe
 
3
Zn
 
5
S
 
10
2.CB.05aRudashevskyite
(Fe,Zn)S
2.CB.10aChalcopyrite
CuFeS
 
2
2.CB.10aEskebornite
CuFeSe
 
2
2.CB.10aGallite
CuGaS
 
2
2.CB.10bHaycockite
Cu
 
4
Fe
 
5
S
 
8
2.CB.10aLenaite
AgFeS
 
2
2.CB.10bMooihoekite
Cu
 
9
Fe
 
9
S
 
16
2.CB.10bPutoranite
Cu
 
9
(Fe,Ni)
 
9
S
 
16
2.CB.10aRoquesite
CuInS
 
2
2.CB.10bTalnakhite
Cu
 
9
(Fe,Ni)
 
8
S
 
16
2.CB.10aLaforêtite
AgInS
 
2
2.CB.15aČernýite
Cu
 
2
(Cd,Zn,Fe)SnS
 
4
2.CB.15aFerrokesterite
Cu
 
2
(Fe,Zn)SnS
 
4
2.CB.15aHocartite
Ag
 
2
(Fe
2+
 
,Zn)SnS
 
4
2.CB.15aIdaite
Cu
 
5
FeS
 
6
2.CB.15aKesterite
Cu
 
2
(Zn,Fe)SnS
 
4
2.CB.15aKuramite
Cu
 
3
SnS
 
4
2.CB.15bMohite
Cu
 
2
SnS
 
3
2.CB.15aPirquitasite
Ag
 
2
ZnSnS
 
4
2.CB.15aStannite
Cu
 
2
(Fe,Zn)SnS
 
4
2.CB.15cStannoidite
Cu
+
6
Cu
2+
2
(Fe
2+
 
,Zn)
 
3
Sn
 
2
S
 
12
2.CB.15aVelikite
Cu
 
2
HgSnS
 
4
2.CB.15cUM2006-11-S:CuFeGeZn
Cu
 
8
(Fe,Zn)
 
3
Ge
 
2
S
 
12
(?)
2.CB.20Chatkalite
Cu
 
6
FeSn
 
2
S
 
8
2.CB.20Mawsonite
Cu
 
6
Fe
 
2
SnS
 
8
2.CB.30Colusite
Cu
 
26
V
 
2
(As,Sn,Sb)
 
6
S
 
32
2.CB.30Germanite
Cu
 
13
Fe
 
2
Ge
 
2
S
 
16
2.CB.30Germanocolusite
Cu
 
26
V
 
2
(Ge,As)
 
6
S
 
32
2.CB.30Nekrasovite
Cu
 
26
V
 
2
(Sn,As,Sb)
 
6
S
 
32
2.CB.30Stibiocolusite
Cu
 
13
V
 
4
(Sb,Sn,As)
 
3
S
 
16
2.CB.30Ovamboite
Cu
 
20
(Fe,Cu,Zn)
 
6
W
 
2
Ge
 
6
S
 
32
2.CB.30Maikainite
Cu
 
20
(Fe,Cu)
 
6
Mo
 
2
Ge
 
6
S
 
32
2.CB.35aHemusite
Cu
 
6
SnMoS
 
8
2.CB.35aKiddcreekite
Cu
 
6
SnWS
 
8
2.CB.35aPolkovicite
(Fe,Pb)
 
3
(Ge,Fe)
 
1-x
S
 
4
2.CB.35aRenierite
(Cu,Zn)
 
11
(Ge,As)
 
2
Fe
 
4
S
 
16
2.CB.35aVinciennite
Cu
+
7
Cu
2+
3
Fe
2+
2
Fe
3+
2
Sn(As,Sb)S
 
16
2.CB.35aMorozeviczite
(Pb,Fe)
 
3
Ge
 
1-x
S
 
4
2.CB.35bCatamarcaite
Cu
 
6
GeWS
 
8
2.CB.40Lautite
CuAsS
2.CB.45Cadmoselite
CdSe
2.CB.45Greenockite
CdS
2.CB.45Wurtzite
(Zn,Fe)S
2.CB.45Rambergite
MnS
2.CB.45Buseckite
(Fe,Zn,Mn)S
2.CB.55bIsocubanite
CuFe
 
2
S
 
3
2.CB.60Picotpaulite
TlFe
 
2
S
 
3
2.CB.60Raguinite
TlFeS
 
2
2.CB.65Argentopyrite
AgFe
 
2
S
 
3
2.CB.65Sternbergite
AgFe
 
2
S
 
3
2.CB.70Sulvanite
Cu
 
3
VS
 
4
2.CB.75Vulcanite
CuTe
2.CB.80Empressite
AgTe
2.CB.85Muthmannite
AuAgTe
 
2
Related Minerals - Hey's Index Grouping:

- +
3.1.1Chalcocite
Cu
 
2
S
3.1.2Djurleite
Cu
 
31
S
 
16
3.1.3Digenite
Cu
 
9
S
 
5
3.1.4Anilite
Cu
 
7
S
 
4
3.1.5Roxbyite
Cu
 
9
S
 
5
3.1.6Spionkopite
Cu
 
39
S
 
28
3.1.7Geerite
Cu
 
8
S
 
5
3.1.8Covellite
CuS
3.1.9Berzelianite
Cu
 
2
Se
3.1.10Bellidoite
Cu
 
2
Se
3.1.11Umangite
Cu
 
3
Se
 
2
3.1.12Yarrowite
Cu
 
9
S
 
8
3.1.13Athabascaite
Cu
 
5
Se
 
4
3.1.14Klockmannite
CuSe
3.1.15Krut'aite
CuSe
 
2
3.1.16Weissite
Cu
 
2-x
Te
3.1.17Rickardite
Cu
 
7
Te
 
5
3.1.18Vulcanite
CuTe
3.1.19Bambollaite
Cu(Se,Te)
 
2
3.1.20Lautite
CuAsS
3.1.21Mgriite
Cu
 
3
AsSe
 
3
3.1.23Bornite
Cu
 
5
FeS
 
4
3.1.24Fukuchilite
Cu
 
3
FeS
 
8
3.1.25Chalcopyrite
CuFeS
 
2
3.1.26Mooihoekite
Cu
 
9
Fe
 
9
S
 
16
3.1.27Haycockite
Cu
 
4
Fe
 
5
S
 
8
3.1.28Isocubanite
CuFe
 
2
S
 
3
3.1.29Idaite
Cu
 
5
FeS
 
6
3.1.30Nukundamite
Cu
 
3.4
Fe
 
0.6
S
 
4
3.1.31Putoranite
Cu
 
9
(Fe,Ni)
 
9
S
 
16
3.1.32Orickite
2CuFeS
 
2
· H
 
2
O
3.1.33Eskebornite
CuFeSe
 
2
3.1.34Chaméanite
(Cu,Fe)
 
4
As(Se,S)
 
4
3.1.35Talnakhite
Cu
 
9
(Fe,Ni)
 
8
S
 
16

Other Names for Cubanite

Synonyms:
BarracaniteChalcopyrrhotiteChalmersiteCubanCupropyrite (of Schneider)
Other Languages:
German:Barracanit
Chalmersit
Cubanit
Russian:Кубанит
Simplified Chinese:方黄铜矿
古巴矿
铜磁黄铁矿
Spanish:Barracanita
Chalmersita
Cubanita

Other Information

Magnetism:Ferromagnetic
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 Cubanite

Reference List:

- +
Breithaupt, J. F. A. (1843): Cuban, ein neuer, dem Weisskupfererz ähnlicher Kies. Annalen der Physik und Chemie, 59, 325-327.

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, 834pp.: 243-245.

Greenwood, N.N. and Whitfield, H.J. (1968) Mössbauer effect studies on cubanite (CuFe2S3) and related iron sulfides. Journal of the Chemical Society, A: 1697-1699.

Fleet, M. E. (1971): Refinement of the crystal structure of cubanite and polymorphism of CuFe2S3. Zeitschrift für Kristallographie, 132, 276-287.

Cabri L J, Hall S R, Szymanski J T, Stewart J M (1973): On the transformation of cubanite. Canadian Mineralogist, 12, 33-38.

Szymanski, J. T. (1974): A refinement of the structure of cubanite, CuFe2S3. Zeitschrift für Kristallographie, 140, 218-239.

Dutrizac, J. E. (1976): Reactions in cubanite and chalcopyrite. Canadian Mineralogist, 14, 172-181.

Chandra, U., Parthasarathy, G., Sharma, P. (2010): Synthetic cubanite CuFe2S3: pressure-induced transformation to isocubanite. Canadian Mineralogist, 48, 1137-1147.

Internet Links for Cubanite

Search Engines:
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  • Look for Cubanite on Wikipedia
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Cubanite details from Handbook of Mineralogy (PDF)
  • Mineral Dealers:
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  • Cubanite specimens for sale - minfind.com
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  • SpiriferMinerals.com - high quality low prices
  • Fabre Minerals - search for Cubanite specimens
  • rare and unusual minerals mainly crystallized
  • Find Cubanite on www.crystalclassics.co.uk
  • Buy from David K Joyce minerals
  • Search for Cubanite on Well-Arranged Molecules
  • Buy from McDougall Minerals
  • Specimens:The following Cubanite specimens are currently listed for sale on minfind.com.

    Localities for Cubanite

    The 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.
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