TrekGEO > Mineral Trail > Koshinetsu region > Nagano pref. > Zunyite

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Hongo Mine

Kaize, Sakuho city, Minami-Saku county, Nagano pref., Japan


Field of view: 10 mm. Zunyite associated with pyrite. The pale brown tetrahedral crystals are zunyite. The fine pale yellow grains at the bottom are pyrite.

Recovered from an open space of a quartz vein in a hydrothermal deposit associated with pyrophyllitization hydrothermal alteration. Formed in the late Miocene (11 Ma).

Zunyite from this location was described in 1994.

Other localities

  • Hongo Mine (Hydrothermal, Tetrahedral)
  • Mount Kawate (Hydrothermal, Tetrahedral)
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