TrekGEO > Mineral Trail > Kanto region > Ibaraki pref. > Mount Myoken

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Mount Myoken

Kozuma village, Hitachi-Ota city, Ibaraki pref., Japan

This locality is a natural monument of Satomi village, and closed to collecting.


Spodumene subtype rare-element pegmatite

Rare-element class pegmatite in the Late Cretaceous (100 Ma) Tabito pluton, a member of the S-type (Ilmenite-series) Abukuma granitic rocks. The age of the Tabito pluton by K-Ar radiometric dating of hornblende and biotite.

Mount Myoken

Outcrop of spodumene subtype rare-element pegmatite in the Tabito Pluton. The translucent white parts are quartz. The opaque white parts with perfect cleavage, at the bottom of this photograph for example, are albite. The pale pink flakes with perfect cleavage are trilithionite.

Reported Minerals

Mineral Assemblages

  • Quartz - Feldspar - Lepidolite - Elbaite
  • Quartz - Feldspar - Spodumene - Montebrasite
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