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Geffroyite

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About GeffroyiteHide

Formula:
(Cu,Fe,Ag)9(Se,S)8
Lustre:
Metallic
Hardness:
Specific Gravity:
5.39 (Calculated)
Crystal System:
Isometric
Name:
For Jacques Geffroy ((1918–1993), French metallurgist at French Atomic Energy Commission.
This page provides mineralogical data about Geffroyite.


Classification of GeffroyiteHide

Approved
2.BB.15

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
B : Metal Sulfides, M: S > 1: 1 (mainly 2: 1)
B : With Ni
2.7.1.6

2 : SULFIDES
7 : AmBnXp, with (m+n):p = 9:8
3.2.18

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

Physical Properties of GeffroyiteHide

Metallic
Transparency:
Opaque
Hardness:
2½ on Mohs scale
Hardness:
VHN15=67 - 72 kg/mm2 - Vickers
Density:
5.39 g/cm3 (Calculated)

Chemical Properties of GeffroyiteHide

Formula:
(Cu,Fe,Ag)9(Se,S)8
IMA Formula:
(Cu,Fe,Ag)9Se8

Crystallography of GeffroyiteHide

Crystal System:
Isometric
Class (H-M):
m3m (4/m 3 2/m) - Hexoctahedral
Space Group:
Fm3m
Setting:
Fm3m
Cell Parameters:
a = 10.889 Å
Unit Cell V:
1,291.11 ų (Calculated from Unit Cell)
Z:
4
Morphology:
Micro myrmekitic intergrowth with clausthalite and eskebornite

Type Occurrence of GeffroyiteHide

Synonyms of GeffroyiteHide

Other Language Names for GeffroyiteHide

German:Geffroyit
Spanish:Geffroyita

Relationship of Geffroyite to other SpeciesHide

Other Members of this group:
ArgentopentlanditeAg(Fe,Ni)8S8Iso. m3m (4/m 3 2/m) : Fm3m
Cobaltpentlandite(Co,Ni,Fe)9S8Iso. m3m (4/m 3 2/m) : Fm3m
OberthüriteRh3Ni32S32Iso.
Pentlandite(FexNiy)Σ9S8Iso. m3m (4/m 3 2/m) : Fm3m
SugakiiteCu(Fe,Ni)8S8Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm

Common AssociatesHide

Associated Minerals Based on Photo Data:
Eskebornite3 photos of Geffroyite associated with Eskebornite on mindat.org.
Uraninite3 photos of Geffroyite associated with Uraninite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

2.BB.HoromaniteFe6Ni3S8Tet. 4/mmm (4/m 2/m 2/m) : P4/mmm
2.BB.SamaniiteCu2Fe5Ni2S8Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
2.BB.UM2007-27-S:CuFeIrNiRh(Ni,Fe,Cu,Rh,Ir)11S9
2.BB.05HeazlewooditeNi3S2Trig. 3 2 : R3 2
2.BB.05OregoniteNi2FeAs2Hex.
2.BB.05Vozhminite(Ni,Co)4(As,Sb)S2Hex.
2.BB.05UM2007-30-S:FeFe3S2
2.BB.10ArsenohauchecorniteNi18Bi3AsS16Tet.
2.BB.10BismutohauchecorniteNi9Bi2S8Tet. 4/mmm (4/m 2/m 2/m) : P4/mmm
2.BB.10HauchecorniteNi9BiSbS8Tet. 4/mmm (4/m 2/m 2/m) : P4/mmm
2.BB.10TellurohauchecorniteNi9Bi(Te,Bi)S8Tet.
2.BB.10TučekiteNi9Sb2S8Tet.
2.BB.15ArgentopentlanditeAg(Fe,Ni)8S8Iso. m3m (4/m 3 2/m) : Fm3m
2.BB.15Cobaltpentlandite(Co,Ni,Fe)9S8Iso. m3m (4/m 3 2/m) : Fm3m
2.BB.15Godlevskite(Ni,Fe)9S8Orth. 2 2 2 : C2 2 2
2.BB.15Kharaelakhite(Cu,Pt,Pb,Fe,Ni)9S8Orth. mmm (2/m 2/m 2/m) : Pmmm
2.BB.15Manganoshadlunite(Mn,Pb,Cd)(Cu,Fe)8S8
2.BB.15Pentlandite(FexNiy)Σ9S8Iso. m3m (4/m 3 2/m) : Fm3m
2.BB.15Shadlunite(Pb,Cd)(Fe,Cu)8S8
2.BB.15SugakiiteCu(Fe,Ni)8S8Tet. 4/mmm (4/m 2/m 2/m) : P42/mnm
2.BB.15UM2002-26-S:FeNi(Ni,Fe)9S8Hex.

Related Minerals - Dana Grouping (8th Ed.)Hide

2.7.1.1Pentlandite(FexNiy)Σ9S8Iso. m3m (4/m 3 2/m) : Fm3m
2.7.1.2ArgentopentlanditeAg(Fe,Ni)8S8Iso. m3m (4/m 3 2/m) : Fm3m
2.7.1.3Cobaltpentlandite(Co,Ni,Fe)9S8Iso. m3m (4/m 3 2/m) : Fm3m
2.7.1.4Shadlunite(Pb,Cd)(Fe,Cu)8S8
2.7.1.5Manganoshadlunite(Mn,Pb,Cd)(Cu,Fe)8S8

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

3.2.1AcanthiteAg2SMon. 2/m : P21/m
3.2.3NaumanniteAg2SeOrth. 2 2 2 : P21 21 21
3.2.4AguilariteAg4SeSMon. 2/m
3.2.5HessiteAg2TeMon. 2/m : P21/b
3.2.6EmpressiteAgTeOrth. mmm (2/m 2/m 2/m)
3.2.7StütziteAg5-xTe3, x = 0.24-0.36Hex. 6 : P6
3.2.8CervelleiteAg4TeSMon. 2/m
3.2.9DervilliteAg2AsS2Mon. 2/m : P2/b
3.2.10StromeyeriteAgCuSOrth. mmm (2/m 2/m 2/m)
3.2.11MckinstryiteAg5-xCu3+xS4Orth. mmm (2/m 2/m 2/m) : Pnma
3.2.12JalpaiteAg3CuS2Tet.
3.2.13EucairiteAgCuSeOrth.
3.2.14CameroniteCu5-x(Cu,Ag)3+xTe10 (x = 0.43)Mon. 2/m : B2/b
3.2.15Henryite(Cu,Ag)3+xTe2 , with x ~ 0.40 Iso. m3m (4/m 3 2/m) : Fd3c
3.2.16SternbergiteAgFe2S3Orth. mmm (2/m 2/m 2/m)
3.2.17ArgentopyriteAgFe2S3Mon. 2/m
3.2.19ArgentopentlanditeAg(Fe,Ni)8S8Iso. m3m (4/m 3 2/m) : Fm3m

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.

References for GeffroyiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Johan, Z., Picot, P., Ruhlmann, F. (1982): Evolution paragénétique de la minéralisation uranifère de Chaméane (Puy-de-Dôme), France: chaméanite, geffroyite et giraudite, trois séléniures nouveaux de Cu, Fe, Ag et As. Tschermaks Mineralogische und Petrographische Mitteilungen 29, 151-167 (in French).
American Mineralogist: 67: 1074-1075.
Canadian Mineralogist: 12: 169-177.

Internet Links for GeffroyiteHide

Localities for GeffroyiteHide

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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Argentina
 
  • Córdoba
    • Calamuchita Department
MUTTI, D. y GONZALEZ CHIOZZA, S.. Evolución petrotectónica del distrito minero Cerro Áspero y modelo de emplazamiento de los depósitos wolframíferos, Córdoba. Rev. Asoc. Geol. Argent. [online]. 2005, vol.60, n.1, pp. 159-173
Australia
 
  • Tasmania
    • West Coast municipality
      • Queenstown district
Bottrill, R. S. (2000). A Mineralogical Field Guide for the Western Tasmania Minerals and Museums Tour.
Canada
 
  • Ontario
    • Sudbury District
      • Levack Township
Ames, D.E., Kjarsgaard, I.M., and Douma, S.L., 2003, Sudbury Ni-Cu-PGE Ore Mineralogy Compilation: Sudbury Targeted Geoscience Initiative (TGI): Geological Survey of Canada, Open File 1787
Chile
 
  • Antofagasta Region
    • Antofagasta Province
      • Antofagasta
Arfè, G., Boni, M., Mondillo, N., Aiello, R., Balassone, G., Arseneau, V. and Soyk, D. (2016): Supergene alteration in the Capricornio Au-Ag epithermal vein system, Antofagasta Region, Chile. Can. Mineral. 54, 681-706.
Czech Republic
 
  • Plzeň Region
    • Planá u Mariánských Lázní (Plan)
Scharmová, M., Scharm, B.: Minerály selenu na uranovém ložisku Zadní Chodov. Bulletin mineralogicko-petrografického oddělení Národního muzea v Praze, 1995, roč. 3, s. 43-47.
El Salvador
 
  • Usulután Department
Raymond, J., Williams-Jones, A. E., & Clark, J. R. (2005). Mineralization associated with scale and altered rock and pipe fragments from the Berlin geothermal field, El Salvador; implications for metal transport in natural systems. Journal of volcanology and geothermal research, 145(1), 81-96.
France (TL)
 
  • Auvergne-Rhône-Alpes
    • Puy-de-Dôme
      • Sauxillanges
        • Chaméane
Tschermaks Min.Petr.Mitt.(1982) 29, 151-167; Econ Geol (1997) 92:468-484
Germany
 
  • Saxony-Anhalt
    • Harz
Wittern: "Mineralfundorte in Deutschland", 2001
Mexico
 
  • Sonora
    • Mun. de Moctezuma
Lapis 2001(1), 11-40
Handbook of Mineralogy
Portugal
 
  • Vila Real District
    • Sabrosa
Bowles, J. (1987). Silver mineralization at the Vale das Gatas tungsten mine, Portugal. Mineralogical Magazine, 51, 305-10.
USA
 
  • California
    • Inyo Co.
      • Inyo Mts (Inyo Range)
        • Malpais Mesa
Adams, P.M. (2016): Sulfide, selenium and rare earth mineralization in the Sulfate Stope, Santa Rosa Mine, Inyo County, California. 2016 Desert Symposium Field Guide and Proceedings, California State University, Desert Studies Consortium, 244-252.; Paul M. Adams (2017) The Santa Rosa mine, Inyo County, California. Minerlogical Record 48:755-777
  • Montana
    • Lewis and Clark Co.
      • Marysville District
Gearity, E. C. (2013). Geology of the Marysville Mining District, Montana: two phases of mineralization (Master dissertation, Montana State University-Bozeman, College of Letters & Science).
Mineral and/or Locality  
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