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Giraudite

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Formula:
Cu
 
6
[Cu
 
4
(Fe,Zn)
 
2
]As
 
4
Se
 
13
System:IsometricHardness:3½ - 4
Member of:Tetrahedrite Group
Name:For Roger Giraud, electron microprobe laboratory, BRGM-CNRS, Orleans, France


Tetrahedrite Group.

Classification of Giraudite

IMA status:Approved
Strunz 8th edition ID:2/C.11-30
Nickel-Strunz 10th (pending) edition ID:2.GB.05

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
B : Neso-sulfarsenites, etc. with additional S
Dana 8th edition ID:3.3.6.5

3 : SULFOSALTS
3 : 3 <ø < 4
Hey's CIM Ref.:5.1.11

5 : Sulphosalts - Sulpharsenites and Sulphobismuthites (those containing Sn, Ge,or V are in Section 6)
1 : Sulpharsenites etc. of Cu
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Type Occurrence of Giraudite

Type Locality:Chaméane Uranium Deposit, Chaméane, Sauxillanges, Puy-de-Dôme, Auvergne, France
Place of Conservation of Type Material:National School of Mines, Paris, France
Year of Discovery:1982
Geological Setting of type material:Late stage veins cutting granite.

Physical Properties of Giraudite

Lustre:Metallic
Diaphaneity (Transparency):Opaque
Hardness (Mohs):3½ - 4
Hardness (Vickers):VHN25=233 - 333 kg/mm2
Density (calculated):5.75 g/cm3

Crystallography of Giraudite

Crystal System:Isometric
Class (H-M):4 3m - Hextetrahedral
Space Group:I4 3m
Cell Parameters:a = 10.578Å
Unit Cell Volume:V 1,183.62 ų (Calculated from Unit Cell)
Z:2
Morphology:Anhedral grains to 400 microns, myrmekitic intergrowths with chameanite.

Chemical Properties of Giraudite

Formula:
Cu
 
6
[Cu
 
4
(Fe,Zn)
 
2
]As
 
4
Se
 
13
Idealised Formula:
(Cu,Zn,Ag)
 
12
(As,Sb)
 
4
(Se,S)
 
13
Essential elements:As, Cu, Fe, Se
All elements listed in formula:As, Cu, Fe, Se, Zn
Common Impurities:Hg,Fe

Relationship of Giraudite to other Species

Member of:Tetrahedrite Group
Other Members of Group:

- +
Argentotennantite
Ag
 
6
[Cu
 
4
(Fe,Zn)
 
2
]As
 
4
S
 
13
Freibergite
Ag
 
6
[Cu
 
4
Fe
 
2
]Sb
 
4
S
 
13-x
Goldfieldite
Cu
 
12
(Te,Sb,As)
 
4
S
 
13
Hakite
Cu
 
6
[Cu
 
4
Hg
 
2
]Sb
 
4
Se
 
13
Tennantite
Cu
 
6
[Cu
 
4
(Fe,Zn)
 
2
]As
 
4
S
 
13
Tetrahedrite
Cu
 
6
[Cu
 
4
(Fe,Zn)
 
2
]Sb
 
4
S
 
13
Related Minerals - Nickel-Strunz Grouping):

- +
2.GB.05Argentotennantite
Ag
 
6
[Cu
 
4
(Fe,Zn)
 
2
]As
 
4
S
 
13
2.GB.05Freibergite
Ag
 
6
[Cu
 
4
Fe
 
2
]Sb
 
4
S
 
13-x
2.GB.05Goldfieldite
Cu
 
12
(Te,Sb,As)
 
4
S
 
13
2.GB.05Hakite
Cu
 
6
[Cu
 
4
Hg
 
2
]Sb
 
4
Se
 
13
2.GB.05Tennantite
Cu
 
6
[Cu
 
4
(Fe,Zn)
 
2
]As
 
4
S
 
13
2.GB.05Tetrahedrite
Cu
 
6
[Cu
 
4
(Fe,Zn)
 
2
]Sb
 
4
S
 
13
2.GB.10Selenostephanite
Ag
 
5
Sb(Se,S)
 
4
2.GB.10Stephanite
Ag
 
5
SbS
 
4
2.GB.15Pearceite
[(Ag,Cu)
 
6
(As,Sb)
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
2.GB.15Polybasite
[(Ag,Cu)
 
6
(Sb,As)
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
2.GB.15UM2003-14-S:AgBiFeTe
Ag
 
16
FeBiTe
 
3
S
 
8
2.GB.15Selenopolybasite
[(Ag,Cu)
 
6
(Sb,As)
 
2
(S,Se)
 
7
][Ag
 
9
Cu(S,Se)
 
2
Se
 
2
]
2.GB.15Cupropearceite
[Cu
 
6
As
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
2.GB.15Cupropolybasite
[Cu
 
6
Sb
 
2
S
 
7
][Ag
 
9
CuS
 
4
]
2.GB.15UM1979-17-S:BiCuFe
Cu
 
18
Fe
 
4
BiS
 
16
2.GB.20Galkhaite
(Cs,Tl)(Hg,Cu,Zn)
 
6
(As,Sb)
 
4
S
 
12
Related Minerals - Hey's Index Grouping:

- +
5.1.1Sinnerite
Cu
 
6
As
 
4
S
 
9
5.1.2Tennantite
Cu
 
6
[Cu
 
4
(Fe,Zn)
 
2
]As
 
4
S
 
13
5.1.4Chalcostibite
CuSbS
 
2
5.1.5Tetrahedrite
Cu
 
6
[Cu
 
4
(Fe,Zn)
 
2
]Sb
 
4
S
 
13
5.1.6Goldfieldite
Cu
 
12
(Te,Sb,As)
 
4
S
 
13
5.1.7Emplectite
CuBiS
 
2
5.1.8Cuprobismutite
Cu
 
8
AgBi
 
12
S
 
24
5.1.9Wittichenite
Cu
 
3
BiS
 
3
5.1.10Hodrušite
Cu
 
8
Bi
 
12
S
 
22
5.1.11Permingeatite
Cu
 
3
SbSe
 
4

Other Names for Giraudite

Synonyms:
IMA1980-089
Other Languages:
German:Giraudit
Spanish:Giraudita

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 Giraudite

Reference List:

- +
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.

Internet Links for Giraudite

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    • Localities for Giraudite

    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.
    France
     
    • Auvergne
      • Puy-de-Dôme
        • Sauxillanges
          • Chaméane
    		Tschermaks Min.Petr.Mitt.(1982) 29, 151-167; Econ Geol (1997) 92:468-484
    Germany
     
    • Saxony
      • Erzgebirge
        • Schlema-Hartenstein District
    		Can Min 40, 4, (2002), 1161-1170
            • Shaft 366
    		The Canadian Mineralogist, V 42, 2004, pp. 1719-1732.
    Mexico
     
    • Mexico
      • Mun. de Temascaltepec
        • Temascaltepec de González (Temascaltepec)
    		Camprubi, A., Canals, A., Cardellach, E., Prol-Ledesma, R.M., Rivera, R., 2001, The La Guitarra Ag-Au low-sulfidation epithermal deposit, Temascaltepec district, Mexico: vein structure, mineralogy, and sulfide-sulfosalt chemistry. Society of Economic Geologists Special Publication, v. 8, p. 133-158.
    • Sonora
      • Mun. de Moctezuma
    		Lapis 2001(1), 11-40
    USA
     
    • Nevada
      • Lyon Co.
        • Talapoosa District
    		NBMG Spec. Pub. 31 Minerals of Nevada
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