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Mount Hokiya

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


Low-temperature zeolite facies metamorphic rocks

Phenocryst and zeolite in vesicules of Basalt of Pliocene Hokiyadake Volcanics.

Mount Hokiyadake

Outcrop of basalt of Hokiyadake Volcanics. 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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