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Hiikoba, Hizen village, Karatsu city, Saga pref., Japan


Basalt vesicules

Minerals in vesicules of the late Pliocene (3 Ma) alkali basalt, a member of the Higashi-Matsuura Basalt erupted on the ground surface. The type locality of Kimuraite-Y, Kozoite-Nd, Kozoite-La, and Lanthanite-Nd.


Outcrop of alkali basalt of the Higashi-Matsuura Basalt. The massive pale gray host is alkali basalt. A part of vesicules are filled with white calcite and aragonite with minor amount of Nd- and La-bearing minerals.

Reported Minerals

  • Kimuraite-Y
  • Kozoite-Nd
  • Kozoite-La
  • Lanthanite-Nd
  • Calcite
  • Aragonite
  • Lokkaite-Y
  • Hyalite

Mineral Assemblages

  • Aragonite - Kimuraite-Y


Related Occurrences

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