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Banjo

Banjo, Tokigawa city, Hiki county, Saitama pref., Japan

Occurrence

Greenschist facies metamorphic rocks

Sanbagawa Metamorphic Rocks subjected to Blueschist facies to Greenschist facies metamorphism. The protolith is volcaniclastic rocks such as tuff.

Banjo

Outcrop of blue glaucophane schist of Sanbagawa Metamorphic Rocks. The blue parts are glaucophane-bearing schist and the brown parts are Fe3+ stilpnomelane-bearing schist. White veins are quartz. There are two occurences of stilpnomelane: Stilpnomelane surrounding quartz-rich beds parallel to the schistosity and stilpnomelane veins vertical to the schistosity.

Reported Minerals

  • Riebeckite
  • Fe3+ rich Stilpnomelane
  • Hematite
  • Actinolite

Mineral Assemblages

  • Glaucophane - Fe3+ rich Stilpnomelane - Quartz - Magnetite
  • Quartz(Gangue) - Hematite
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