TrekGEO > Mineral Trail > Koshinetsu region > Nagano pref. > Mount Hokiya

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Mount Hokiya

Toyosaka, Matsushiro village, Nagano city, Nagano pref., Japan

Occurrence

Low-temperature zeolite facies metamorphic rocks

Phenocryst and zeolite in vesicules of the early Miocene (16 Ma) Hoshina Basalt, the top bed of the Uchimura Formation.

Mount Hokiyadake

Outcrop of the Hoshina Basalt of the Uchimura Formation. The white parts in this photograph are zeolite in vesicules of altered black basalt. Zeolite-bearing basalt ditributes as an altered brown vertical zone in the outcrop. The width of the zone is approximately 1.5 m.

Reported Minerals

Mineral Assemblages

  • Dachiardite
  • Mordenite
  • Basalt(Host) - Bytownite
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