TrekGEO > Mineral Trail > Kanto region > Kanagawa pref. > Yaga

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Yaga, Yamakita city, Ashigara-Kami county, Kanagawa pref., Japan



Phenocrysts in an andesite dike intruded in the early to Middle Pleistocene (2-0.7 Ma) Ashigara Group. The Ashigara Group is composed of sediments, andesitic lava, and andesitic pyroclasts. The Ashigara Group is considered as trough-fill sediments. Famous locality for augite since 1900's. Ages of sedimentary rocks were determined by microfossiles.

Reported Minerals

Mineral Assemblages

  • Andesite (Host) - Augite
  • Andesite (Host) - Bytownite


Related Occurrences

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