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Mineralogy and Petrology

, Volume 46, Issue 2, pp 155–161 | Cite as

Potosiite and incaite from the Hoei mine, Japan

  • M. Shimizu
  • G. H. Moh
  • A. Kato
Article

Summary

Potosiite and incaite have been found at the Hoei mine, Oita Prefecture, Japan. Potosiite occurs as tabular crystals (3 cm x 2 cm in size), and is associated with arsenopyrite, pyrrhotite, stannite,jamesonite and pyrite, whereas incaite occurs as polycrystalline aggregates rimming galena or as hair-like masses in a matrix of kutnahorite. X-ray powder data reveal that these minerals are potosiite and incaite, respectively. Electron-microprobe analyses of potosiite and incaite gave the general formula (Pb, Sn)2+6+xFeSb2Sn4+2S14+x, with x < 2. Potosiite is homogeneous, whereas incaite, in contact with galena, is quite heterogeneous. Reflectance data for potosiite show that its bireflectance is one of the lowest among opaque minerals with a sheet-like structure.

Keywords

Japan Geochemistry General Formula Galena Arsenopyrite 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Potosiit und incait von der Hoei-mine, Japan

Zusammenfassung

Potosiit and Incait wurden in Erzen der Hoei-Mine, Oita Präfektur, Japan, nachgewiesen. Potosiit kommt in plattigen Kristallen (3 cm x 2 cm) vor and ist mit Arsenkies, Magnetkies, Zinnkies, Jamesonit and Pyrit assoziiert. Incait kommt in polykristallinen Aggregaten, die Ränder um Bleiglanz bilden, oder als Haar-artige Massen in einer Matrix von Kutnahorite vor. Röntgendiffraktionsdaten zeigen, daß es sich hier um Potosiit and Incait handelt; Mikrosondenanalysen der beiden Minerale geben die allgemeine Formel (Pb, Sn)2+6+x(FeSb24+)2S4+x, with x < 2. Potosiit ist homogen, während Incait in Kontakt mit Bleiglanz inhomogen ist. Quantitative Reflexionsdaten für Potosiit zeigen, daß seine Bireflexion zu den niedrigsten bei opaken Mineralen mit Schichtgitter gehört.

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Copyright information

© Springer-Verlag 1992

Authors and Affiliations

  • M. Shimizu
    • 1
  • G. H. Moh
    • 2
  • A. Kato
    • 3
  1. 1.Department of Petrology and Mineral Deposits, University MuseumUniversity of TokyoBunkyo-ku, TokyoJapan
  2. 2.Mineralogisch-Petrographisches Institut der UniversitätHeidelberg 1Germany
  3. 3.Department of GeologyNational Science Museum (Natural History Institute)TokyoJapan

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