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Fletcherite

A valid IMA mineral species
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05318160017271923188086.jpg
Fletcherite, etc.

Fletcher Mine, West Fork, Reynolds County, Missouri, USA
08919050017271923215276.jpg
Fletcherite

San José claim, Chóvar, Castellón, Valencian Community, Spain
07860310017271923301742.jpg
Fletcherite

San José claim, Chóvar, Castellón, Valencian Community, Spain
05318160017271923188086.jpg
Fletcherite, etc.

Fletcher Mine, West Fork, Reynolds County, Missouri, USA
08919050017271923215276.jpg
Fletcherite

San José claim, Chóvar, Castellón, Valencian Community, Spain
07860310017271923301742.jpg
Fletcherite

San José claim, Chóvar, Castellón, Valencian Community, Spain
05318160017271923188086.jpg
Fletcherite, etc.

Fletcher Mine, West Fork, Reynolds County, Missouri, USA
08919050017271923215276.jpg
Fletcherite

San José claim, Chóvar, Castellón, Valencian Community, Spain
Hide all sections | Show all sections

About FletcheriteHide

Formula:
CuNi2S4
Often contains Co substituting for Ni.
Colour:
Steel gray
Lustre:
Metallic
Hardness:
5
Specific Gravity:
4.76 (Calculated)
Crystal System:
Isometric
Name:
Named for the type locality, the Fletcher Mine, Reynolds Co., Missouri, USA.
See also Unnamed (Fe3+-analogue of Fletcherite).


Unique IdentifiersHide

Mindat ID:
1557
Long-form identifier:
mindat:1:1:1557:4

IMA Classification of FletcheriteHide

Classification of FletcheriteHide

Strunz-mindat (2026):
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
Dana 8th ed.:
2.10.1.3

2 : SULFIDES
10 : AmBnXp, with (m+n):p = 3:4
Hey's CIM Ref.:
3.11.12

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

Mineral SymbolsHide

As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

SymbolSourceReference for Standard
FtcIMA–CNMNCWarr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of FletcheriteHide

Lustre:
Metallic
Transparency:
Opaque
Colour:
Steel gray
Hardness:
5 on Mohs scale
Hardness:
VHN25=446 - 464 kg/mm2 - Vickers
Density:
4.76 g/cm3 (Calculated)

Optical Data of FletcheriteHide

Reflectivity:
WavelengthR1 (%)
420nm36.4%
460nm40.9%
500nm42.5%
546nm43.4%
589nm45.3%
640nm43.8%


Graph shows reflectance levels at different wavelengths (in nm). Peak reflectance is 45.3%.
Colour in reflected light:
Creamy white

Chemistry of FletcheriteHide

Mindat Formula:
CuNi2S4

Often contains Co substituting for Ni.
Element Weights:
Element% weight
S41.482 %
Ni37.966 %
Cu20.552 %

Calculated from ideal end-member formula.
S
Ni
Cu
Elements listed:
Cu, Ni, S - search for minerals with similar chemistry
Common Impurities:
Co,Fe

Crystallography of FletcheriteHide

Crystal System:
Isometric
Class (H-M):
m3m(4/m32/m) - Hexoctahedral
Space Group:
Fd3m
Cell Parameters:
a = 9.520 Å
Unit Cell V:
862.80 ų (Calculated from Unit Cell)
Z:
8
Morphology:
Minute crystals to 200 microns.
Comment:
Space group assumed by comparison to related thiospinels.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
1.68 Å(vs)
1.83 Å(s)
2.87 Å(m)
2.39 Å(m)
1.37 Å(m)
1.24 Å(m)
1.19 Å(m)

Geological EnvironmentHide

Paragenetic Mode(s):
Paragenetic ModeEarliest Age (Ga)
High-𝑇 alteration and/or metamorphism
33 : Minerals deposited by hydrothermal metal-rich fluids (see also [#12])

Type Occurrence of FletcheriteHide

Type Locality:
ⓘ Fletcher Mine, West Fork, Reynolds County, Missouri, USA
General Appearance of Type Material:
Anhedral crystals, up to 200 ”m, disseminated in copper sulfides.
Place of Conservation of Type Material:
1) The Natural History Museum, London, England.
2) Royal Ontario Museum, Toronto, Canada, M35070.
3) National Museum of Natural History (Smithsonian), Washington, D.C., USA, 137072.
Geological Setting of Type Material:
Disseminated in copper minerals
Associated Minerals at Type Locality:
BorniteChalcopyriteCovelliteDigenitePyrite
Vaesite
Reference:
Craig, J. R., Carpenter, A. B. (1977) Fletcherite, Cu(Ni,Co)2S4, a new thiospinel from the Viburnum Trend (New Lead Belt), Missouri. Economic Geology, 72 (3). 480-486 doi:10.2113/gsecongeo.72.3.480

Synonyms of FletcheriteHide

Other Language Names for FletcheriteHide

Relationship of Fletcherite to other SpeciesHide

Member of:
Carrollite Subgroup > Thiospinel Group > Spinel Supergroup
Other Members of Carrollite Subgroup:
BerndlehmanniteCu(CrV)S4Iso. m3m(4/m32/m) : Fd3m
CarrolliteCuCo2S4Iso. m3m(4/m32/m) : Fd3m
Cuproiridsite(Cu,Fe)Ir2S4Iso. m3m(4/m32/m) : Fd3m
CuprokalininiteCu(Cr3+Cr4+)S4Iso. m3m(4/m32/m) : Fd3m
EzochiiteCu+(Rh3+Pt4+)S4Iso. m3m(4/m32/m) : Fd3m
Florensovite(Cu,Zn)Cr1.5Sb0.5S4Iso. m3m(4/m32/m)
MalaniteCu+(Ir3+Pt4+)S4Iso. m3m(4/m32/m)
RhodostanniteCu+(Fe2+0.5Sn4+1.5)S4Tet. 4/m : I41/a
ShiranuiiteCu+(Rh3+Rh4+)S4Iso. m3m(4/m32/m) : Fd3m
ToyohaiteAg+(Fe2+0.5Sn4+1.5)S4Tet. 4/m : I41/a
'Unnamed (Fe3+-analogue of Fletcherite)'Cu(Fe3+,Ni,Co)2S4

Common AssociatesHide

Associations Based on Photo Data:
4 photos of Fletcherite associated with AnhydriteCaSO4
1 photo of Fletcherite associated with BorniteCu5FeS4
1 photo of Fletcherite associated with ChalcopyriteCuFeS2
1 photo of Fletcherite associated with PyriteFeS2

Related Minerals - Strunz-mindat GroupingHide

2.DA.FerrodimolybdeniteFeMo2S4Mon. 2/m : B2/b
2.DA.ZaykoviteRh3Se4Mon. 2/m : B2/m
2.DA.EzochiiteCu+(Rh3+Pt4+)S4Iso. m3m(4/m32/m) : Fd3m
2.DA.GrimmiteNiCo2S4Iso. m3m(4/m32/m) : Fd3m
2.DA.ZolenskyiteFeCr2S4Mon. 2/m : B2/m
2.DA.05ShiranuiiteCu+(Rh3+Rh4+)S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05Florensovite(Cu,Zn)Cr1.5Sb0.5S4Iso. m3m(4/m32/m)
2.DA.05SiegeniteCoNi2S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05CadmoinditeCdIn2S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05KalininiteZnCr2S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05ViolariteFe2+Ni3+2S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05NickeltyrrelliteCuNi2Se4Iso. m3m(4/m32/m) : Fd3m
2.DA.05LinnaeiteCo2+Co3+2S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05CarrolliteCuCo2S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05Cuproiridsite(Cu,Fe)Ir2S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05Cuprorhodsite(Cu+0.5Fe3+0.5)Rh3+2S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05BerndlehmanniteCu(CrV)S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05PolydymiteNi2+Ni3+2S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05TrĂŒstedtiteNi3Se4Iso. m3m(4/m32/m) : Fd3m
2.DA.05DaubréeliteFe2+Cr3+2S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05CuprokalininiteCu(Cr3+Cr4+)S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05GreigiteFe2+Fe3+2S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05JoegoldsteiniteMnCr2S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05BornhardtiteCo2+Co3+2Se4Iso. m3m(4/m32/m) : Fd3m
2.DA.05TyrrelliteCu(Co,Ni)2Se4Iso. m3m(4/m32/m) : Fd3m
2.DA.05InditeFeIn2S4Iso. m3m(4/m32/m) : Fd3m
2.DA.05XingzhongitePb2+Ir3+2S4Iso.
2.DA.05MalaniteCu+(Ir3+Pt4+)S4Iso. m3m(4/m32/m)
2.DA.10RhodostanniteCu+(Fe2+0.5Sn4+1.5)S4Tet. 4/m : I41/a
2.DA.10ToyohaiteAg+(Fe2+0.5Sn4+1.5)S4Tet. 4/m : I41/a
2.DA.15BrezinaiteCr3S4Mon. 2/m
2.DA.15Heideite(Fe,Cr)1.15(Ti,Fe)2S4Mon. 2/m : B2/m
2.DA.20KonderiteCu3Pb(Rh,Pt,Ir)8S16Hex. 6/m : P6/m
2.DA.20InaglyiteCu3Pb(Ir,Pt)8S16Hex.
2.DA.25KingstoniteRh3S4Mon. 2/m : B2/m

Other InformationHide

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

Internet Links for FletcheriteHide

References for FletcheriteHide

Localities for FletcheriteHide

Showing 23 localities.

This 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.
Hide all sections | Show all sections

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.
Austria
 
  • Lower Austria
    • Sankt Pölten-Land District
      • Karlstetten
        • Rosenthal
Kolitsch et al. (2023)
Brazil
 
  • Bahia
    • MaracĂĄs
      • Rio JacarĂ© layered complex
Campbell (2012)
  • ParĂĄ
    • CurionĂłpolis
Berni et al. (2014)
Canada
 
  • Ontario
    • Cochrane District
      • Timmins
        • Kidd Township
Kidd Operations
Czech Republic
 
  • Karlovy Vary Region
OndruĆĄ et al. (2003)
  • Liberec Region
    • Jablonec nad Nisou District
      • Jablonec nad Nisou
Dolníček et al. (2025)
DR Congo
 
  • Haut-Katanga
    • Kambove Territory
      • Shinkolobwe
Gauthier
Ecuador
 
  • Carchi Province
    • Awa Indian Preserve
Wu et al. (2026)
Finland
 
  • Lapland
    • Ranua
Mutanen
France
 
  • Auvergne-RhĂŽne-Alpes
    • Ain
      • Bourg-en-Bresse
        • Jayat
Ducluzaux (2022)
Germany
 
  • Saxony-Anhalt
    • Salzlandkreis
L. Kruszewski specimen
Driesner et al. (1993) +1 other reference
Greece
 
  • Central Macedonia
    • Kilkis
      • Kilkis
Stergiou et al. (2021)
Namibia
 
  • Kunene Region
    • Epupa
DrĂŒppel et al. (2006)
DrĂŒppel +2 other references
Poland
 
  • ƚwiętokrzyskie Voivodeship
    • Kielce County
      • Gmina Chęciny
        • Miedzianka
Lenik et al. (2019)
Portugal
 
  • Aveiro
    • Albergaria-a-Velha
      • Branca
Marques de SĂĄ et al. (2010)
Russia
 
  • Khabarovsk Krai
    • Ayano-Maysky district
      • Konder alkaline-ultrabasic massif
- (2016) +1 other reference
  • Zabaykalsky Krai
    • Gazimuro-Zavodsky District
Kovalev et al. (2019)
Spain
 
  • Valencian Community
    • CastellĂłn
      • ChĂłvar
Honrubia et al. (2002)
USA
 
  • Missouri
    • Reynolds County
      • Ellington
Rocks & Min.: 64:22&26.
      • West Fork
Economic Geology
Leach et al. (1995)
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