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

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Onigasaki

Hama, Kawazu city, Kamo county, Shizuoka pref., Japan

Occurrence

Rhyolite

Phenocryst of rhyolite in the lower part of the late Miocene (7.0 Ma) Shirahama Group. The Shirahama Group unconformably overlies the Miocene Yugashima Group. Ages of sediments were determined by microfossils and K-Ar radiometric dating.

Onigasaki

Width: 30 mm. Outcrop of weathered rhyolite o fthe Shirahama Group. Phenocrysts were etched out on the surface. Rounded gray grains are beta-quartz, and platy opaque white crystals are orthoclase.

Reported Minerals

Mineral Assemblages

  • Rhyolite(Host) - Orthoclase - Beta-Quartz

Localities

Related Occurrences

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