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


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.


Japan Geochemistry General Formula Galena Arsenopyrite 
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Potosiit und incait von der Hoei-mine, Japan


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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