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Usami

Usami, Ito city, Shizuoka pref., Japan

Occurrence

Andesite

Phenocryst of andesite of the Late Pleistocene (1.2 - 0.3 Ma) Usami volcano, and cryatals in its xenoliths.

Ikebukuro

Outcrop of andesite. Most of the outcrop is composed of andesite. The concaved parts are weathered xenolith.

Reported Minerals

  • Anorthite
  • Forsterite
  • Hypersthene
  • Hornblende
  • Tridymite
  • Ilmenite

Mineral Assemblages

  • Andesite (Host) - Anorthite - Hornblende - Hypersthene - Forsterite
  • Xenolith (Host) - Tridymite - Ilmenite

Localities

Related Occurrences

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