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Geffroyite

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Formula:
(Cu,Fe,Ag)
 
9
(Se,S)
 
8
System:IsometricHardness:2½
Name:For Jacques Geffroy, French metallurgist at French Atomic Energy Commission
This page provides mineralogical data about Geffroyite.

Classification of Geffroyite

IMA status:Approved
Strunz 8th edition ID:2/B.16-40
Nickel-Strunz 10th (pending) edition ID: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
Dana 8th edition ID:2.7.1.6

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

Type Locality:Chaméane Uranium Deposit, Chaméane, Sauxillanges, Puy-de-Dôme, Auvergne, France
Year of Discovery:1982
Geological Setting of type material:Late stage veins cutting granite

Physical Properties of Geffroyite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Hardness (Mohs):2½
Hardness (Vickers):VHN15=67 - 72 kg/mm2
Density (calculated):5.39 g/cm3

Crystallography of Geffroyite

Crystal System:Isometric
Class (H-M):m3m (4/m 3 2/m) - Hexoctahedral
Space Group:Fm3m {F4/m 3 2/m}
Space Group Setting:Fm3m
Cell Parameters:a = 10.889Å
Unit Cell Volume:V 1,291.11 ų (Calculated from Unit Cell)
Z:4
Morphology:Micro myrmekitic intergrowth with clausthalite and eskebornite

Chemical Properties of Geffroyite

Formula:
(Cu,Fe,Ag)
 
9
(Se,S)
 
8
Essential elements:Cu, Se
All elements listed in formula:Ag, Cu, Fe, S, Se

Relationship of Geffroyite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.BB.Horomanite
Fe
 
6
Ni
 
3
S
 
8
2.BB.Samaniite
Cu
 
2
Fe
 
5
Ni
 
2
S
 
8
2.BB.UM2007-27-S:CuFeIrNiRh
(Ni,Fe,Cu,Rh,Ir)
 
11
S
 
9
2.BB.05Heazlewoodite
Ni
 
3
S
 
2
2.BB.05Oregonite
Ni
 
2
FeAs
 
2
2.BB.05Vozhminite
(Ni,Co)
 
4
(As,Sb)S
 
2
2.BB.05UM2007-30-S:Fe
Fe
 
3
S
 
2
2.BB.10Arsenohauchecornite
Ni
 
18
Bi
 
3
AsS
 
16
2.BB.10Bismutohauchecornite
Ni
 
9
Bi
 
2
S
 
8
2.BB.10Hauchecornite
Ni
 
9
Bi(Sb,Bi)S
 
8
2.BB.10Tellurohauchecornite
Ni
 
9
Bi(Te,Bi)S
 
8
2.BB.10Tučekite
Ni
 
9
Sb
 
2
S
 
8
2.BB.15Argentopentlandite
Ag(Fe,Ni)
 
8
S
 
8
2.BB.15Cobaltpentlandite
(Co,Ni,Fe)
 
9
S
 
8
2.BB.15Godlevskite
(Ni,Fe)
 
9
S
 
8
2.BB.15Kharaelakhite
(Pt,Cu,Pb,Fe,Ni)
 
9
S
 
8
2.BB.15Manganoshadlunite
(Mn,Pb,Cd)(Cu,Fe)
 
8
S
 
8
2.BB.15Pentlandite
(Fe,Ni)
 
9
S
 
8
2.BB.15Shadlunite
(Pb,Cd)(Fe,Cu)
 
8
S
 
8
2.BB.15Sugakiite
Cu(Fe,Ni)
 
8
S
 
8
2.BB.15UM2002-26-S:FeNi
(Ni,Fe)
 
9
S
 
8
Related Minerals - Hey's Index Grouping:

- +
3.2.1Acanthite
Ag
 
2
S
3.2.3Naumannite
Ag
 
2
Se
3.2.4Aguilarite
Ag
 
4
SeS
3.2.5Hessite
Ag
 
2
Te
3.2.6Empressite
AgTe
3.2.7Stützite
Ag
 
5-x
Te
 
3
, x = 0.24-0.36
3.2.8Cervelleite
Ag
 
4
TeS
3.2.9Dervillite
Ag
 
2
AsS
 
2
3.2.10Stromeyerite
AgCuS
3.2.11Mckinstryite
Ag
 
5-x
Cu
 
3+x
S
 
4
, x ~ 0-0.28
3.2.12Jalpaite
Ag
 
3
CuS
 
2
3.2.13Eucairite
AgCuSe
3.2.14Cameronite
AgCu
 
7
Te
 
10
3.2.15Henryite
Ag
 
3
Cu
 
4
Te
 
4
3.2.16Sternbergite
AgFe
 
2
S
 
3
3.2.17Argentopyrite
AgFe
 
2
S
 
3
3.2.19Argentopentlandite
Ag(Fe,Ni)
 
8
S
 
8

Other Names for Geffroyite

Synonyms:
IMA1980-090
Other Languages:
German:Geffroyit
Spanish:Geffroyita

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 Geffroyite

Reference List:

- +
American Mineralogist: 67: 1074-1075.

Canadian Mineralogist: 12: 169-177.

Internet Links for Geffroyite

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

    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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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    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
    Czech Republic
     
    • Bohemia (Böhmen; Boehmen)
      • 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.
    France
     
    • Auvergne
      • Puy-de-Dôme
        • Sauxillanges
          • Chaméane
    		Tschermaks Min.Petr.Mitt.(1982) 29, 151-167; Econ Geol (1997) 92:468-484
    Germany
     
    • Saxony-Anhalt
      • Harz Mts
    		Wittern: "Mineralfundorte in Deutschland", 2001
    Mexico
     
    • Sonora
      • Mun. de Moctezuma
    		Lapis 2001(1), 11-40
    Handbook of Mineralogy
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    Copyright © Jolyon Ralph and Ida Chau 1993-2011. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them.Further information contact the Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of hundreds of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register. Current server date and time: 19th Jun 2011 14:33:52
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