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Muthmannite

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Formula:
AuAgTe
 
2
Hardness:2½
Name:For German chemist and crystallographer, Professor Friedrich Wilhelm Muthmann (1861-1913), of Munich.


Originally described as (Ag,Au)Te, recently redefined as AuAgTe2 (Bindi & & Cipriani, 2004).

Classification of Muthmannite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:2/B.07-70
Nickel-Strunz 10th (pending) edition ID:2.CB.85

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
C : Metal Sulfides, M: S = 1: 1 (and similar)
B : With Zn, Fe, Cu, Ag, etc.
Dana 8th edition ID:2.8.26.

2 : SULFIDES
8 : AmXp, with m:p = 1:1
Hey's CIM Ref.:3.3.8

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

Type Locality:Sacarîmb (Sãcãrâmb; Szekerembe; Nagyág), Hunedoara Co., Romania
Year of Discovery:1911

Physical Properties of Muthmannite

Hardness (Mohs):2½
X-Ray Powder Diffraction:
d-spacingIntensity
5.124 (12)
3.346 (16)
3.052 (22)
3.051 (19)
2.562 (24)
2.488 (93)
2.487 (100)
2.210 (42)
1.8592 (22)
1.5931 (17)
Comments:From calculated pattern. Similar to the data for calaverite.

Chemical Properties of Muthmannite

Formula:
AuAgTe
 
2
Essential elements:Ag, Au, Te
All elements listed in formula:Ag, Au, Te
Common Impurities:Pb,Sb,S

Relationship of Muthmannite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
2.CB.05aColoradoite
HgTe
2.CB.05aHawleyite
CdS
2.CB.05aMetacinnabar
HgS
2.CB.05cPolhemusite
(Zn,Hg)S
2.CB.05bSakuraiite
(Cu,Zn,Fe)
 
3
(In,Sn)S
 
4
2.CB.05aSphalerite
ZnS
2.CB.05aStilleite
ZnSe
2.CB.05aTiemannite
HgSe
2.CB.05UM1998-15-S:CuFeZn
Cu
 
2
Fe
 
3
Zn
 
5
S
 
10
2.CB.05aRudashevskyite
(Fe,Zn)S
2.CB.10aChalcopyrite
CuFeS
 
2
2.CB.10aEskebornite
CuFeSe
 
2
2.CB.10aGallite
CuGaS
 
2
2.CB.10bHaycockite
Cu
 
4
Fe
 
5
S
 
8
2.CB.10aLenaite
AgFeS
 
2
2.CB.10bMooihoekite
Cu
 
9
Fe
 
9
S
 
16
2.CB.10bPutoranite
Cu
 
9
(Fe,Ni)
 
9
S
 
16
2.CB.10aRoquesite
CuInS
 
2
2.CB.10bTalnakhite
Cu
 
9
(Fe,Ni)
 
8
S
 
16
2.CB.10aLaforêtite
AgInS
 
2
2.CB.15aČernýite
Cu
 
2
(Cd,Zn,Fe)SnS
 
4
2.CB.15aFerrokesterite
Cu
 
2
(Fe,Zn)SnS
 
4
2.CB.15aHocartite
Ag
 
2
(Fe
2+
 
,Zn)SnS
 
4
2.CB.15aIdaite
Cu
 
5
FeS
 
6
2.CB.15aKesterite
Cu
 
2
(Zn,Fe)SnS
 
4
2.CB.15aKuramite
Cu
 
3
SnS
 
4
2.CB.15bMohite
Cu
 
2
SnS
 
3
2.CB.15aPirquitasite
Ag
 
2
ZnSnS
 
4
2.CB.15aStannite
Cu
 
2
(Fe,Zn)SnS
 
4
2.CB.15cStannoidite
Cu
+
6
Cu
2+
2
(Fe
2+
 
,Zn)
 
3
Sn
 
2
S
 
12
2.CB.15aVelikite
(Cu,Hg)
 
11
Sn
 
4
S
 
16
2.CB.15cUM2006-11-S:CuFeGeZn
Cu
 
8
(Fe,Zn)
 
3
Ge
 
2
S
 
12
 (?)
2.CB.20Chatkalite
Cu
 
6
FeSn
 
2
S
 
8
2.CB.20Mawsonite
Cu
 
6
Fe
 
2
SnS
 
8
2.CB.30Colusite
Cu
 
26
V
 
2
(As,Sn,Sb)
 
6
S
 
32
2.CB.30Germanite
Cu
 
13
Fe
 
2
Ge
 
2
S
 
16
2.CB.30Germanocolusite
Cu
 
26
V
 
2
(Ge,As)
 
6
S
 
32
2.CB.30Nekrasovite
Cu
 
26
V
 
2
(Sn,As,Sb)
 
6
S
 
32
2.CB.30Stibiocolusite
Cu
 
13
V
 
4
(Sb,Sn,As)
 
3
S
 
16
2.CB.30Ovamboite
Cu
 
20
(Fe,Cu,Zn)
 
6
W
 
2
Ge
 
6
S
 
32
2.CB.30Maikainite
Cu
 
20
(Fe,Cu)
 
6
Mo
 
2
Ge
 
6
S
 
32
2.CB.35aHemusite
Cu
 
6
SnMoS
 
8
2.CB.35aKiddcreekite
Cu
 
6
SnWS
 
8
2.CB.35aPolkovicite
(Fe,Pb)
 
3
(Ge,Fe)
 
1-x
S
 
4
2.CB.35aRenierite
(Cu,Zn)
 
11
(Ge,As)
 
2
Fe
 
4
S
 
16
2.CB.35aVinciennite
Cu
+
7
Cu
2+
3
Fe
2+
2
Fe
3+
2
Sn(As,Sb)S
 
16
2.CB.35aMorozeviczite
(Pb,Fe)
 
3
Ge
 
1-x
S
 
4
2.CB.35bCatamarcaite
Cu
 
6
GeWS
 
8
2.CB.40Lautite
CuAsS
2.CB.45Cadmoselite
CdSe
2.CB.45Greenockite
CdS
2.CB.45Wurtzite
(Zn,Fe)S
2.CB.45Rambergite
MnS
2.CB.55aCubanite
CuFe
 
2
S
 
3
2.CB.55bIsocubanite
CuFe
 
2
S
 
3
2.CB.60Picotpaulite
TlFe
 
2
S
 
3
2.CB.60Raguinite
TlFeS
 
2
2.CB.65Argentopyrite
AgFe
 
2
S
 
3
2.CB.65Sternbergite
AgFe
 
2
S
 
3
2.CB.70Sulvanite
Cu
 
3
VS
 
4
2.CB.75Vulcanite
CuTe
2.CB.80Empressite
AgTe
Related Minerals - Hey's Index Grouping:

- +
3.3.1Calaverite
AuTe
 
2
3.3.2Krennerite
(Au,Ag)Te
 
2
3.3.3Kostovite
CuAuTe
 
4
3.3.4Uytenbogaardtite
Ag
 
3
AuS
 
2
3.3.5Fischesserite
Ag
 
3
AuSe
 
2
3.3.6Petrovskaite
AuAg(S,Se)
3.3.7Petzite
Ag
 
3
AuTe
 
2
3.3.9Sylvanite
(Au,Ag)
 
2
Te
 
4
3.3.10Penzhinite
(Ag,Cu)
 
4
Au(S,Se)
 
4
3.3.11Bezsmertnovite
(Au,Ag)
 
4
Cu(Te,Pb)
3.3.12Bilibinskite
PbCuAu
 
3
Te
 
2
3.3.13Bogdanovite
(Au,Te,Pb)
 
3
(Cu,Fe)
3.3.14Montbrayite
(Au,Sb)
 
2
Te
 
3

Other Names for Muthmannite

Other Languages:
German:Muthmannit
Russian:Мутманнит
Spanish:Muthmannita

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 Muthmannite

Reference List:

- +
Zambonini (1911), Zeitschrift für Kristallographie: 49: 246.

Palache, Charles, Harry Berman & Clifford Frondel (1944), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana Yale University 1837-1892, Volume I: Elements, Sulfides, Sulfosalts, Oxides. John Wiley and Sons, Inc., New York. 7th edition, revised and enlarged: 260-261.

Doklady Akademii Nauk SSSR (1984): 280: 996.

Bindi, L. & Cipriani, C. (2004): Ordered distribution of Au and Ag in the crystal structure of muthmannite, AuAgTe2, a rare telluride fom Sacarîmb, western Romania. Am. Mineral., 89, 1505-1509.

Bindi, L. (2008): Commensurate-incommensurate phase transition in muthmannite,
AuAgTe2: First evidence of a modulated structure at low-temperature.
Philosophical Magazine Letters, 88, 533-541.

Internet Links for Muthmannite

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    • Localities for Muthmannite

    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.
    Brazil
     
    • Pará
      • Carajás mineral province
        • Parauapebas
    		Grainger, C.J., Groves, D.I., Tallarico, F.H.B., and Fletcher, I.R. (2008): Ore Geology Reviews 33, 451-489.
    Romania
     
    • Alba Co.
    		AmMin 89:1505–1509 (2004)
    • Hunedoara Co.
    		Transactions of the USSR Academy of Sc., volume 280, pp. 159 (1985); Bindi, L. & Cipriani, C. (2004): Ordered distribution of Au and Ag in the crystal structure of muthmannite, AuAgTe2, a rare telluride fom Sacarîmb, western Romania. Am. Mineral., 89, 1505-1509.
    Russia
     
    • Urals Region
      • Southern Urals
        • Orenburgskaya Oblast'
          • Gay
    		Vikent'ev, I.V., Moloshag, V.P. and Yudovskaya, M.A. (2006): Geology of Ore Deposits 48(2), 77-107.
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