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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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    • 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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    Updated Mineral Entry: BykovaiteFrom Van King, 17th Feb 2012 19:50:20