Muthmannite (original) (raw)

A valid IMA mineral species - grandfathered

05466360017056064882686.jpg

05466360017056064882686.jpg

05466360017056064882686.jpg

About MuthmanniteHide

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05884890015038450141648.jpg

Colour:

Brassy yellow to pale bronze

Specific Gravity:

11.04 (Calculated)

Crystal System:

Monoclinic

Name:

Named in honor of Friedrich Wilhelm Muthmann (8 February 1861, Elberfeld - 3 August 1913, Munich), German chemist and crystallographer, and professor at Technische Hochschule, Munich.

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

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:2819:2

527c87db-d77a-4227-9e2e-7291f0ad28da

IMA Classification of MuthmanniteHide

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Approved, 'Grandfathered' (first described prior to 1959)

Type description reference:

Classification of MuthmanniteHide

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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.

2.8.26.

2 : SULFIDES
8 : AmXp, with m:p = 1:1

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

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Symbol Source Reference
Mma IMA–CNMNC Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of MuthmanniteHide

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Colour:

Brassy yellow to pale bronze

Comment:

pale gray on fresh fracture

Streak:

Black to gray-black

Hardness:

VHN15=194 kg/mm2 - Vickers

Cleavage:

Perfect
in zone of elongation

Fracture:

Irregular/Uneven

Density:

11.04 g/cm3 (Calculated)

Optical Data of MuthmanniteHide

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Reflectivity:

Wavelength R
420nm 42.3%
440nm 41.3%
460nm 40.4%
480nm 39.7%
500nm 39.2%
520nm 38.7%
540nm 38.4%
560nm 38.2%
580nm 38.1%
600nm 38.0%
620nm 38.0%
640nm 38.0%
660nm 38.1%
680nm 38.2%
700nm 38.4%

Reflectance graph
Graph shows reflectance levels at different wavelengths (in nm). Top of box is 100%. Peak reflectance is 42.3%.

Colour in reflected light:

pale gray

Chemistry of MuthmanniteHide

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Common Impurities:

Pb,Sb,S

Crystallography of MuthmanniteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 5.124(2) Å, b = 4.419(1) Å, c = 7.437 Å
β = 89.96°

Ratio:

a:b:c = 1.16 : 1 : 1.683

Unit Cell V:

168.40 ų (Calculated from Unit Cell)

Comment:

some analogies to calaverite

Crystal StructureHide

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ID Species Reference Link Year Locality Pressure (GPa) Temp (K)
0003649 Muthmannite Bindi L, Cipriani C (2004) Ordered distribution of Au and Ag in the crystal structure of muthmannite, AuAgTe2, a rare telluride from Sacarimb, Western Romania American Mineralogist 89 1505-1509 2004 0 293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

d-spacing Intensity
5.124 Å (12)
3.346 Å (16)
3.052 Å (22)
3.051 Å (19)
2.562 Å (24)
2.488 Å (93)
2.487 Å (100)
2.210 Å (42)
1.8592 Å (22)
1.5931 Å (17)

Comments:

From calculated pattern. Similar to the data for calaverite.

Geological EnvironmentHide

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Type Occurrence of MuthmanniteHide

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Place of Conservation of Type Material:

University of Naples Museum, Naples, Italy.

Reference:

Zambonini, F. (1911) Uber den Muthmannit, ein neues mineral. Zeitschrift für Kristallographie: 49: 246-249.

Other Language Names for MuthmanniteHide

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Related Minerals - Strunz-mindat GroupingHide

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2.CB. Agmantinite Ag2MnSnS4 Orth.
2.CB. Richardsite Zn2CuGaS4 Tet. 42_m_ : I_42_m
2.CB. Gachingite Au(Te1-xSex) Orth. m m m _(_2/_m_2/_m_2/m )
2.CB. Tolstykhite Au3S4Te6 Tric. 1 : _P_1
2.CB. Hanswilkeite KFeS2 Mon. 2/m : _B_2/b
2.CB. Auroselenide AuSe Mon. 2/m : _B_2/m
2.CB. Ruizhongite (Ag2◻)Pb3Ge2S8 Iso. 43_m_ : I_43_d
2.CB. Okruginite Cu2SnSe3 Mon. m : B b
2.CB.05a Coloradoite HgTe Iso. 43_m_ : F_43_m
2.CB.05a Hawleyite CdS Iso. 43_m_ : F_43_m
2.CB.05a Metacinnabar HgS Iso. 43_m_ : F_43_m
2.CB.05c Polhemusite (Zn,Hg)S Tet.
2.CB.05b Sakuraiite (Cu,Zn,Fe)3(In,Sn)S4 Iso.
2.CB.05a Sphalerite ZnS Iso. 43_m_ : F_43_m
2.CB.05a Stilleite ZnSe Iso. 43_m_ : F_43_m
2.CB.05a Tiemannite HgSe Iso. 43_m_ : F_43_m
2.CB.05 UM1998-15-S:CuFeZn Cu2Fe3Zn5S10
2.CB.05a Rudashevskyite (Fe,Zn)S Iso. 43_m_ : F_43_m
2.CB.05a Ishiharaite (Cu,Ga,Fe,In,Zn)S Iso. 43_m_ : F_43_m
2.CB.07a Shenzhuangite NiFeS2 Tet. 42_m_ : I_42_d
2.CB.07a Unnamed (Cu-Mn-Sn Sulphide) Cu2MnSnS4
2.CB.10a Chalcopyrite CuFeS2 Tet. 42_m_ : I_42_d
2.CB.10a Eskebornite CuFeSe2 Tet. 42_m_ : P_42_c
2.CB.10a Gallite CuGaS2 Tet. 42_m_ : I_42_d
2.CB.10b Haycockite Cu4Fe5S8 Orth. 222
2.CB.10a Lenaite AgFeS2 Tet. 42_m_ : I_42_d
2.CB.10b Mooihoekite Cu9Fe9S16 Tet. 42_m_ : P_42_m
2.CB.10b Putoranite Cu1.1Fe1.2S2 Iso. m_3_m _(_4/_m_32/m ) : P n_3_m
2.CB.10a Roquesite CuInS2 Tet. 42_m_ : I_42_d
2.CB.10b Talnakhite Cu9(Fe,Ni)8S16 Iso. 43_m_ : I_43_m
2.CB.10a Laforêtite AgInS2 Tet. 42_m_ : I_42_d
2.CB.10a Unnamed (Cu-Zn-In Sulphide) CuZn2InS4
2.CB.10a UM1984-30-S:CuFeSn Cu2Fe2Sn3S7
2.CB.10c Omariniite Cu8Fe2ZnGe2S12 Orth. 222 : _I_222
2.CB.15a Černýite Cu2(Cd,Zn,Fe)SnS4 Tet. 42_m_ : I_42_m
2.CB.15a Ferrokësterite Cu2FeSnS4 Tet. 4 : _I_4
2.CB.15a Hocartite Ag2(Fe2+,Zn)SnS4 Tet. 42_m_ : I_42_m
2.CB.15a Idaite Cu5FeS6 Hex.
2.CB.15a Kësterite Cu2ZnSnS4 Tet. 4 : _I_4
2.CB.15a Kuramite Cu3SnS4 Tet. 42_m_ : I_42_m
2.CB.15b Mohite Cu2SnS3 Mon.
2.CB.15a Pirquitasite Ag2ZnSnS4 Tet. 4 : _I_4
2.CB.15a Stannite Cu2FeSnS4 Tet. 42_m_ : I_42_m
2.CB.15c Stannoidite Cu+6Cu2+2(Fe2+,Zn)3Sn2S12 Orth. 222 : _I_222
2.CB.15a Velikite Cu2HgSnS4 Tet. 4 : _I_4
2.CB.15c UM2006-11-S:CuFeGeZn Cu8(Fe,Zn)3Ge2S12 (?)
2.CB.17a v Arsenic-bearing Renierite Cu11GeAsFe4S16
2.CB.20 Chatkalite Cu6FeSn2S8 Tet. 42_m_ : _P_4_m_2
2.CB.20 Mawsonite Cu6Fe2SnS8 Tet. 42_m_ : _P_4_m_2
2.CB.30 Argyropyrite near Ag2Fe7S11
2.CB.30 Colusite Cu13VAs3S16 Iso. 43_m_ : P_43_n
2.CB.30 Germanite Cu13Fe2Ge2S16 Iso. 43_m_ : P_43_n
2.CB.30 Germanocolusite Cu26V2(Ge,As)6S32 Iso. 43_m_ : P_43_m
2.CB.30 Nekrasovite Cu26V2(Sn,As,Sb)6S32 Iso. 43_m_ : P_43_n
2.CB.30 Stibiocolusite Cu13V(Sb,Sn,As)3S16 Iso. 43_m_ : P_43_m
2.CB.30 Ovamboite Cu20(Fe,Cu,Zn)6W2Ge6S32 Iso. 43_m_ : P_43_n
2.CB.30 Maikainite Cu20(Fe,Cu)6Mo2Ge6S32 Iso. m_3_m _(_4/_m_32/m )
2.CB.30 Frieseite Ag2Fe5S8 (?)
2.CB.35a Hemusite Cu6SnMoS8 Iso.
2.CB.35a Kiddcreekite Cu6SnWS8 Iso. 43_m_ : F_43_m
2.CB.35a Polkovicite (Fe,Pb)3(Ge,Fe)1-xS4 Iso.
2.CB.35a Renierite (Cu1+,Zn)11Fe4(Ge4+,As5+)2S16 Tet. 42_m_ : P_42_c
2.CB.35a Vinciennite Cu+7Cu2+3Fe2+2Fe3+2Sn(As,Sb)S16 Tet.
2.CB.35a Morozeviczite (Pb,Fe)3Ge1-xS4 Iso.
2.CB.35b Catamarcaite Cu6GeWS8 Hex. 6_m_ m : P_63_m c
2.CB.40 Lautite CuAsS Orth. m m m _(_2/_m_2/_m_2/m ) : P n m a
2.CB.42 Lingbaoite AgTe3 Trig. 3_m_ : R_3_m
2.CB.45 Cadmoselite CdSe Hex. 6_m_ m : P_63_m c
2.CB.45 Greenockite CdS Hex. 6_m_ m : P_63_m c
2.CB.45 Wurtzite (Zn,Fe)S Hex. 6_m_ m : P_63_m c
2.CB.45 Rambergite MnS Hex. 6_m_ m : P_63_m c
2.CB.45 Buseckite (Fe,Zn,Mn)S Hex. 6_m_ m : P_63_m c
2.CB.45 Maletoyvayamite Au3Se4Te6 Tric. 1 : _P_1
2.CB.47 Murchisite Cr5S6 Trig. 3_m_ _(_32/m ) : P_31_c
2.CB.50 Zincselenide ZnSe
2.CB.50 Wassonite TiS Trig. 3_m_ _(_32/m ) : R_3_m
2.CB.52 Dzhezkazganite ReMoCu2PbS6 ? Trig. 3_m_ : R_3_m
2.CB.55a Cubanite CuFe2S3 Orth. m m m _(_2/_m_2/_m_2/m )
2.CB.55b Isocubanite CuFe2S3 Iso. m_3_m _(_4/_m_32/m ) : F m_3_m
2.CB.60 Picotpaulite TlFe2S3 Orth. m m m _(_2/_m_2/_m_2/m ) : C m c m
2.CB.60 Raguinite TlFeS2 Orth.
2.CB.65 Argentopyrite AgFe2S3 Mon. 2/m
2.CB.65 Sternbergite AgFe2S3 Orth. m m m _(_2/_m_2/_m_2/m )
2.CB.70 Sulvanite Cu3VS4 Iso. 43_m_ : P_43_m
2.CB.75 Vulcanite CuTe Orth. m m m _(_2/_m_2/_m_2/m )
2.CB.80 Empressite AgTe Orth. m m m _(_2/_m_2/_m_2/m )

Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

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References for MuthmanniteHide

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Localities for MuthmanniteHide

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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

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and 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 (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.

Brazil
Pará Parauapebas Alemão Cu deposit ⓘ Igarapé Bahia mine Grainger et al. (2008)
China
Gansu Dingxi Min Co. ⓘ Zhaishang Au deposit Xinhui Liu et al. (2011) +1 other reference
Hebei Zhangjiakou Chongli District Shuiquangou Complex Dongping Au-Te ore field ⓘ Dongping Mine Wang et al. (2019)
Finland
Lapland Sodankylä Viiankiaapa mire area ⓘ Sakattilampi (Sakatti deposit) Fröclich et al. (2017) +1 other reference
Greece
Central Macedonia Chalkidiki Aristotelis Kassandra mining district ⓘ Skouries Mine McFall et al. (2016)
Poland
Lower Silesian Voivodeship Karkonosze County Kowary ⓘ Kowarska Czuba Mt. Kozłowski et al. (2022)
Romania
Alba County ⓘ Baia de Arieș AmMin 89:1505–1509 (2004)
Hunedoara County Certeju de Sus ⓘ Săcărâmb (TL) Transactions of the USSR Academy of Sc. et al. (1985) +2 other references
Russia
Belgorod Oblast Kursk Magnetic Anomaly group ⓘ Stoilinskoe Fe deposit Chernyshov et al. (2009, November)
Kamchatka Krai Koryak Okrug Karaginsky District ⓘ Ozernovskoe deposit Spiridonov et al. (2009, April)
Orenburg Oblast Gay ⓘ Gayskoe Zn-Cu deposit (Gayskoye; Gaiskoye) Vikent'ev et al. (2006) +3 other references
USA
Nevada Lyon County Singatse Range Yerington Mining District ⓘ Ann-Mason deposit (Ludwig; Douglas Hill; Cast; Blue Hills; McConnell; Minnesota; Shamrock) Aird et al. (2021)