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Watanabeite

A valid IMA mineral species
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Cu4(As,Sb)2S5
May contain minor Pb (status of this variety, the crystal structure of which was determined by Biagioni et al. (2024), is unclear) - comparezhonghongite.
Colour:
Silver-grey, lead-grey
Lustre:
Metallic
Hardness:
4 - 4½
Specific Gravity:
4.66
Crystal System:
Orthorhombic
Name:
Named in honor of Takeo Watanabe (武男渡辺) (23 June 1907, Tokyo, Japan - 18 December 1986, Nerima, Tokyo, Japan), professor of mineralogy, University of Tokyo (1944-1968), Nagoya University (1968-1971), President of the Akita University (1971-1976), who first reported the occurrence of native tellurium and sylvanite from the Teine mine. He also served as president of the Society of Mining Geologists of Japan, the Geological Society of Japan, and the Mineralogical Society of Japan. He described kotoite and jimboite.
Type Locality:
ⓘTeine Mine, Sapporo City, Ishikari Subprefecture, Hokkaidō Prefecture, Japan
See alsoUnnamed (Sb-analogue of Watanabeite).

Chemically and structurally related tozhonghongite andtennantite/tetraedrite.




Unique Identifiers
Approval year:
1991
First published:
1993
Type description reference:
Shimizu, M., Kato, A., Matsubara, S., Criddle, A. J., Stanley, C. J. (1993) Watanabeite, Cu4(As,Sb)2S5, a new mineral from the Teine mine, Sapporo, Hokkaido, Japan.Mineralogical Magazine, 57 (389) 643-649doi:10.1180/minmag.1993.057.389.08

Classification of Watanabeite

2 : SULFIDES and SULFOSALTS (sulfides, selenides, tellurides; arsenides, antimonides, bismuthides; sulfarsenites, sulfantimonites, sulfbismuthites, etc.)
G : Sulfarsenites, sulfantimonites, sulfbismuthites
C : Poly-sulfarsenites
Dana 8th ed.:
3.5.15.1

3 : SULFOSALTS
5 : 2.5 < ø < 3

Mineral Symbols
Transparency:
Opaque
Colour:
Silver-grey, lead-grey
Streak:
Lead-grey
Hardness:
4 - 4½ onMohs scale
Hardness:
VHN100=253 - 306 kg/mm2 - Vickers
Tenacity:
Brittle
Cleavage:
None Observed
Fracture:
Irregular/Uneven
Density:
4.66(2) g/cm3 (Measured)    4.66 g/cm3 (Calculated)

Optical Data of Watanabeite
Element Weights:
Element% weight
Cu45.040 %
S28.409 %
As26.551 %

Calculated from ideal end-member formula.
Elements listed:
As,Cu,S,Sb -search for minerals with similar chemistry

Crystallography of Watanabeite
General Appearance of Type Material:
Massive silvery lead-grey ore, macroscopically indistinguishable from tetrahedrite group minerals.
Place of Conservation of Type Material:
National Science Museum, Tokyo, catalogue NSM-M26138, University Museum, University of Tokyo, and at the Natural History Museum, London, as E.1400, BM 1992,238
Associated Minerals at Type Locality:
Native BismuthEmplectiteQuartzTennantite Subgroup
Reference:
Shimizu, M., Kato, A., Matsubara, S., Criddle, A. J., Stanley, C. J. (1993) Watanabeite, Cu4(As,Sb)2S5, a new mineral from the Teine mine, Sapporo, Hokkaido, Japan.Mineralogical Magazine, 57 (389) 643-649doi:10.1180/minmag.1993.057.389.08

Synonyms of Watanabeite

Other Language Names for Watanabeite

Related Minerals -Strunz-mindat GroupingTric.1 :P12.GC.05Wallisite(Cu,Ag)TlPbAs2S5Tric.1 :P12.GC.10SinneriteCu6As4S9Tric. 1 :P12.GC.20SimoniteTlHgAs3S6Mon. 2/m2.GC.25QuadratiteAg(Cd,Pb)AsS3Tet. 422 :P43222.GC.25ManganoquadratiteAgMnAsS3Tet. 422 :P43222.GC.30SmithiteAgAsS2Mon. 2/m2.GC.35TrechmanniteAgAsS2Trig.3 :R32.GC.35DebattistiiteAg9Hg0.5As6S12Te2Tric.1 :P12.GC.40aAleksitePbBi2Te2S2Trig.3m(32/m) :P31m2.GC.40dSaddlebackitePb2Bi2Te2S3Hex.2.GC.40cRucklidgeitePbBi2Te4Trig.3m(32/m) :R3m2.GC.40ClogauitePbBi4Te4S3Trig.3m(32/m) :P3m12.GC.40eBabkinitePb2Bi2(S,Se)3Trig.2.GC.40bKochkaritePbBi4Te7Trig.2.GC.40cPoubaitePbBi2(Se,Te,S)4Trig.3m(32/m) :R3m2.GC.45TvalchrelidzeiteHg3SbAsS3Mon. 2/m2.GC.50MutnovskitePb4As2S6IClOrth.mmm(2/m2/m2/m) :Pnma

Other Information
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    • References for WatanabeiteⓘMaría Eugenia veinMarquez-Zavalia et al. (2007)
    Australia
     
    Graham-Ruzicka (2014)
    China
     
    Zheng et al. (2020)Zheng et al. (2024)
    Greece
     
    Voudouris et al. (2005)Repstock (2011)+2 other referencesVoudouris et al. (2011)Papavasiliou et al. (2016)
    India
     
    Ahmed et al. (2018)
    Iran
     
    Mousavi Motlagh et al. (2024)
    Japan (TL)
     
    Shimizu et al. (1993)+1 other reference
    Russia
     
    Sidorov+5 other referencesTolstykh et al. (2019)Efremov et al. (2021)Eremin et al. (2023)
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