TrekGEO > Mineral Trail > Tohoku region > Akita pref. > Glauconite

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Fujisato city, Yamamoto county, Akita pref., Japan

Source for K


Field of view: 50 mm. Glauconite in sandstone. The grayish-green matrix of sandstone is composed of glauconite.

Recovered from sandstone formed on the surface of an andesitic submarine volcano at a back-arc basin in a reductive shallow marine environment of low sedimentation rate. Formed in the late Miocene (7.0 Ma).

Glauconite from this location was described in 1944.

Other localities

  • Fujisato (Sandstone, Matrix)
  • Kuzubukuro (Sandstone, Matrix)
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