TrekGEO > Mineral Trail > Tokai region > Shizuoka pref. > Toge

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Hongo, Fujieda city, Shizuoka pref., Japan



Large phenocrysts in alkali basalt, a member of the early to middle Miocene (17-15 Ma) Takakusa Volcanic Rocks in the early to middle Miocene (18-15 Ma) Oigawa Group. The Oigawa Group is the upper most part of the Setogawa Group of the Shimanto accretionary complex. The basalt has been subjected to Prehnite-Pumpellyite facies metamorphism. Ages of sedimentary rocks and basalt were determined by radiolarians.

Reported Minerals

Mineral Assemblages

  • Alkali basalt(Host) - Kaersutite


  • Hachijo Island (Lava, Anorthite)
  • Miyake Island (Lava, Anorthite)
  • Hawaii (Lava, Forsterite)
  • Toge (Lava, Kaersutite)
  • Kamisano (Dike, Diposide)

Related Occurrences

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