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Watanabeite

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Takeo Watanabe
Formula:
Cu4(As,Sb)2S5
May contain minor Pb (status of this variety is unclear).
Colour:
Silver-grey, lead-grey
Lustre:
Metallic
Hardness:
4 - 4½
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.
See also Unnamed (Sb-analogue of Watanabeite).

Chemically and structurally related to tennantite/tetraedrite.




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Classification of WatanabeiteHide

Approved
Approval Year:
1991
First Published:
1993
2.GC.15

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

3 : SULFOSALTS
5 : 2.5 < ø < 3

Physical Properties of WatanabeiteHide

Metallic
Transparency:
Opaque
Colour:
Silver-grey, lead-grey
Streak:
Lead-grey
Hardness:
4 - 4½ on Mohs scale
Cleavage:
None Observed

Optical Data of WatanabeiteHide

Type:
Anisotropic
Anisotropism:
Weak
Colour in reflected light:
Grey
Pleochroism:
Not Visible

Chemical Properties of WatanabeiteHide

Formula:
Cu4(As,Sb)2S5

May contain minor Pb (status of this variety is unclear).

Crystallography of WatanabeiteHide

Crystal System:
Orthorhombic
Cell Parameters:
a = 14.51 Å, b = 13.3 Å, c = 17.96 Å
Ratio:
a:b:c = 1.091 : 1 : 1.35
Unit Cell V:
3,465.97 ų (Calculated from Unit Cell)
Comment:
Symmetry uncertain and space group unknown.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.43 (4)
3.36 (7)
2.999 (100)
2.594 (20)
2.238 (5)
1.975 (5)
1.833 (40)
1.794 (4)
1.778 (4)
1.564 (15b)
1.497 (5)
Comments:
Pattern is similar to that of fahlore, but has many additional, very weak superstructure reflections.

Type Occurrence of WatanabeiteHide

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
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: 643-649.

Synonyms of WatanabeiteHide

Other Language Names for WatanabeiteHide

German:Watanabeit
Spanish:Watanabeita

Related Minerals - Nickel-Strunz GroupingHide

2.GC.05HatchiteAgTlPbAs2S5Tric. 1 : P1
2.GC.05Wallisite(Cu,Ag)TlPbAs2S5Tric.
2.GC.10SinneriteCu6As4S9Tric. 1 : P1
2.GC.20SimoniteTlHgAs3S6Mon. 2/m
2.GC.25QuadratiteAg(Cd,Pb)AsS3Tet.
2.GC.25ManganoquadratiteAgMnAsS3Tet. 4 2 2 : P43 2 2
2.GC.30SmithiteAgAsS2Mon. 2/m
2.GC.35TrechmanniteAgAsS2Trig.
2.GC.40aAleksitePbBi2Te2S2Trig.
2.GC.40bKochkaritePbBi4Te7Trig.
2.GC.40cPoubaitePbBi2(Se,Te,S)4Trig.
2.GC.40cRucklidgeitePbBi2Te4Trig.
2.GC.40eBabkinitePb2Bi2(S,Se)3Trig.
2.GC.40dSaddlebackitePb2Bi2Te2S3Hex.
2.GC.45TvalchrelidzeiteHg3SbAsS3Mon. 2/m
2.GC.50MutnovskitePb4As2S6IClOrth. mmm (2/m 2/m 2/m) : Pnma

Other InformationHide

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

References for WatanabeiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Luce, F.D., Tuttle, C.L., Skinner, B.J. (1977) Studies of sulfosalts of copper: V. Phases and phase relations in the system Cu-Sb-As-S between 350° and 500°C. Economic Geology: 22: 271-289. [on synthetic watanabeite; not cited in watanabeite description!]
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: 643-649.
New Minerals (1997), New Minerals 1990-1994.
Repstock, A., Voudouris, P., Kolitsch, U. (2015) New occurrences of watanabeite, colusite, “arsenosulvanite” and “Cu-excess” tetrahedrite-tennantite at the Pefka highsulfidation epithermal deposit, northeastern Greece. Neues Jahrbuch für Mineralogie Abhandlungen (J. Min. Geochem.): 192: 135-149.

Internet Links for WatanabeiteHide

Localities for WatanabeiteHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Argentina
 
  • Catamarca
    • Andalgalá Department
      • Cerro Atajo
MARQUEZ-ZAVALIA, M. F. and GALLISKI, M. A.. Chatkalita, nekrasovita y otros minerales del grupo de la estannita de veta María Eugenia, Cerro Atajo, Catamarca. Rev. Asoc. Geol. Argent. [online]. 2007, vol.62, n.2, pp. 289-298.
Greece
 
  • Thraki Department (Thrace; Thracia)
    • Évros Prefecture
      • Alexandroupoli (Alexandroupolis)
        • Pefka
Repstock, A. (2011): Ore mineralogical investigation of the Au, Ag, Te, Cu, Pb, Zn-bearing epithermal veins at Pefka mine, western Thrace, northeastern Greece. Unpubl. Diploma Thesis, University of Hamburg, Germany, 97 pp. (in German).; Repstock, A., Voudouris, P., & Kolitsch, U. (2015). New occurrences of watanabeite, colusite,“arsenosulvanite” and “Cu-excess” tetrahedrite-tennantite at the Pefka high-sulfidation epithermal deposit, northeastern Greece. Neues Jahrbuch für Mineralogie-Abhandlungen: Journal of Mineralogy and Geochemistry, 192(2), 135-149.
Panagiotis Christos Voudouris, Vasilios Melfos, Paul G. Spry, Robert Moritz, Constantinos Papavassiliou und George Falalakis (2011): Mineralogy and geochemical environment of formation of the Perama Hill high-sulfidation epithermal Au-Ag-Te-Se deposit, Petrota Graben, NE Greece. Mineralogy and Petrology 103, 79-100.
      • Kirki Mines (Kirka)
Voudouris, P., Papavasiliou, C., Melfos, V. (2005): Silver mineralogy of St. Philippos deposit (NE Greece) and its relationship to a Te-bearing porphyry-Cu-Mo mineralization. Geochemistry, Mineralogy and Petrology, 43, 155-160.
Japan (TL)
 
  • Hokkaido
    • Sapporo
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, 643-649; 島倉広至, 三浦貴生, 浜根大輔, 松枝大治, & 三浦裕行. (2015). 北海道手稲鉱山産 Te, Bi, As 鉱物. 北海道大学地球物理学研究報告, 78, 19-35.
Mineral and/or Locality  
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