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Carrollite

This page kindly sponsored by Robert Manson North
Formula:
Cu(Co,Ni)2S4
System:
Isometric
Colour:
Bright Silver color
Lustre:
Metallic
Hardness:
4½ - 5½
Name:
Named in 1852 by William Leonard Faber after the type locality in Carroll County, Maryland, USA.
Isostructural with:

Classification of Carrollite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Explanation of status:
Chemically verified by Craig, J. R., Vaughan, D. J., and Higgins, J. B., 1979, Phase Relations in the Cu-Co-S System and Mineral Associations of the Carrollite (CuCo2S4) - Linnaeite (Co3S4) Series, Economic Geology, 74:657-671.
2.DA.05

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
D : Metal Sulfides, M: S = 3 :4 and 2:3
A : M:S = 3:4
2.10.1.2

2 : SULFIDES
10 : AmBnXp, with (m+n):p = 3:4
3.10.18

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
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Type Occurrence of Carrollite

Occurrences of Carrollite

Geological Setting:
In hydrothermal vein deposits

Physical Properties of Carrollite

Metallic
Diaphaneity (Transparency):
Opaque
Comment:
very bright
Colour:
Bright Silver color
Comment:
Rarely tarnishes to copper red or violet gray
Streak:
Gray black
Hardness (Mohs):
4½ - 5½
Hardness (Vickers):
VHN100=507 - 586 kg/mm2
Tenacity:
Very brittle
Cleavage:
None Observed
Parting:
poor on {001}
Fracture:
Irregular/Uneven, Conchoidal, Sub-Conchoidal
Density:
4.5 - 4.8 g/cm3 (Measured)    4.83 g/cm3 (Calculated)

Crystallography of Carrollite

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fd3m
Space Group Setting:
Fd3m
Cell Parameters:
a = 9.48Å
Unit Cell Volume:
V 851.97 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Octahedral and cubic crystals, massive, granular, compact
Twinning:
{111} polysynthetic
X-Ray Powder Diffraction:
Image Loading

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

Optical Data of Carrollite

Type:
Isotropic
Pleochroism:
Non-pleochroic
Comments:
R = 41.8 (540 nm)

Chemical Properties of Carrollite

Formula:
Cu(Co,Ni)2S4
Essential elements:
All elements listed in formula:

Relationship of Carrollite to other Species

Other Members of Group:
BornhardtiteCo2+Co23+Se4
CadmoinditeCdIn2S4
Cuproiridsite(Cu,Fe)Ir2S4
CuprokalininiteCuCr2S4
Cuprorhodsite(Cu,Fe)Rh2S4
DaubréeliteFe2+Cr23+S4
Ferrorhodsite(Fe,Cu)(Rh,Ir,Pt)2S4
FletcheriteCu(Ni,Co)2S4
Florensovite(Cu,Zn)Cr1.5Sb0.5S4
GreigiteFe2+Fe23+S4
InditeFeIn2S4
KalininiteZnCr2S4
LinnaeiteCo2+Co23+S4
MalaniteCu(Pt3+,Ir3+)2S4
PolydymiteNi2+Ni23+S4
SiegeniteCoNi2S4
TrüstedtiteNi3Se4
TyrrelliteCu(Co3+,Ni3+)2Se4
ViolariteFe2+Ni23+S4
Xingzhongite(Pb,Cu,Fe)(Ir,Pt,Rh)2S4
2.DA.05BornhardtiteCo2+Co23+Se4
2.DA.05Cuproiridsite(Cu,Fe)Ir2S4
2.DA.05Cuprorhodsite(Cu,Fe)Rh2S4
2.DA.05DaubréeliteFe2+Cr23+S4
2.DA.05FletcheriteCu(Ni,Co)2S4
2.DA.05Florensovite(Cu,Zn)Cr1.5Sb0.5S4
2.DA.05GreigiteFe2+Fe23+S4
2.DA.05InditeFeIn2S4
2.DA.05KalininiteZnCr2S4
2.DA.05LinnaeiteCo2+Co23+S4
2.DA.05MalaniteCu(Pt3+,Ir3+)2S4
2.DA.05PolydymiteNi2+Ni23+S4
2.DA.05SiegeniteCoNi2S4
2.DA.05TrüstedtiteNi3Se4
2.DA.05TyrrelliteCu(Co3+,Ni3+)2Se4
2.DA.05ViolariteFe2+Ni23+S4
2.DA.05Xingzhongite(Pb,Cu,Fe)(Ir,Pt,Rh)2S4
2.DA.05Ferrorhodsite(Fe,Cu)(Rh,Ir,Pt)2S4
2.DA.05CadmoinditeCdIn2S4
2.DA.05CuprokalininiteCuCr2S4
2.DA.10RhodostanniteCu2FeSn3S8
2.DA.10ToyohaiteAg2FeSn3S8
2.DA.15BrezinaiteCr3S4
2.DA.15Heideite(Fe,Cr)1.15(Ti,Fe)2S4
2.DA.20InaglyiteCu3Pb(Ir,Pt)8S16
2.DA.20KonderiteCu3Pb(Rh,Pt,Ir)8S16
2.DA.25Kingstonite(Rh,Ir,Pt)3S4
3.10.1Cobaltpentlandite(Co,Ni,Fe)9S8
3.10.2LinnaeiteCo2+Co23+S4
3.10.3CattieriteCoS2
3.10.4FrebolditeCoSe
3.10.5BornhardtiteCo2+Co23+Se4
3.10.6TrogtaliteCoSe2
3.10.7Hastite
3.10.8MattagamiteCoTe2
3.10.9Modderite(Co,Fe)As
3.10.10Safflorite(Co,Ni,Fe)As2
3.10.11ClinosaffloriteCoAs2
3.10.12SkutteruditeCoAs3-x
3.10.13CobaltiteCoAsS
3.10.14ParacostibiteCoSbS
3.10.15CostibiteCoSbS
3.10.16AlloclasiteCo1-xFexAsS
3.10.17Glaucodot(Co0.50Fe0.50)AsS

Other Names for Carrollite

Name in Other Languages:

Other Information

Other Information:
May have exsolution lamellae with slightly higher Fe composition than the matrix. Riley, J. F., 1980, Ferroan carrollites, cobaltian violarites, and other members of the Linnaeite group: (Co,Ni,Fe,Cu)3S4, Mineralogical Magazine, 43:733-739.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.
Industrial Uses:
Cobalt ore

References for Carrollite

Reference List:
Faber, W. L., 1852, On Carrollite, a new Cobalt Mineral, American Journal of Science, second series, 13:418-419.

Laspeyres (1891), Zeitschrift für Kristallographie: 19: 17.

De Jong, W.F. and Hoog, A. (1928) Carrollite (sychnodymite). Zeitschrift für Kristallographie: 66: 168-171.

Mineralogical Magazine (1980): 43: 733.

Riley, J. F., 1980, Ferroan carrollites, cobaltian violarites, and other members of the Linnaeite group: (Co,Ni,Fe,Cu)3S4, Mineralogical Magazine, 43:733-739.

Wagner, T., and Cook, N.J. (1999): Carrollite and related minerals of the linnaeite group: solid solutions and nomenclature in light of new data from the Siegerland district, Germany. Canadian Mineralogist 37:545–558.

King, Van and Robert L. Morgan
(2005) Crystallograpy of Carrollite from the Kamoya South II mine, Democratic Republic of Congo, Program and Abstracts 32nd Rochester Mineralogical Symposium, Rochester, NY, USA, p. 18-19.

Weiss, S.
(2006): Carrollit, Dolomit, Nickelin, Sphärocobaltit und Baryt aus der Provinz Shaba, Kongo. LAPIS 31 (9), 44-46 (in German).

King, Van T. and Morgan, Robert L.
(2008) Etching of Carrollite from the Kamoya South II Mine, Katanga, Democratic Republic Of Congo, Program and Abstracts 35th Rochester Mineralogical Symposium, p. 27-28.

Gauthier, Gilbert, King, Van, and Morgan, Robert, Carrollite from Kamoya South II Mine, Katanga, Democratic Republic of the Congo, Mineralogical Record, (in press).

Internet Links for Carrollite

Specimens:
The following Carrollite specimens are currently listed for sale on minfind.com.

Localities for Carrollite

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.
Mineral and/or Locality  
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