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Dokura Mine

Yunishigawa, Nikko city, Tochigi pref., Japan

Occurrence

Pneumatolytic Mn skarn deposit

Stratified Mn deposit in accretionary complex of Kuriyama Formation subjected to contact metamorphism to form pneumatolytic skarn by Tadamigawa Granites. There are opinions that Kuriyama Formation is a part of Kurohone-Kiryu Complex of Ashio Belt.

Reported Minerals

  • Pyrrhotite
  • Sphalerite
  • Pyrite
  • Chalcopyrite
  • Johannsenite
  • Mangano-grunerite
  • Rhodonite
  • Pyroxmangite
  • Fluorite
  • Ranciéite
  • Rhodochrosite
  • Chamosite
  • Greenockite
  • Hemimorphite
  • Muscovite
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