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Chichibu Mine

Otaki, Chichibu city, Saitama pref., Japan


Field of view: 50 mm. Diopside associated with vesuvianite. The tabular opaque white crystals are diopside. The brown grains are vesuvianite. The yellow grains are grossular. The basement is mainly composed of translucent white calcite.

Recovered from an open space of skarn formed by contact metamorphism of I-type (Magnetite-series) quartz diorite. Formed in the late Miocene (6 Ma).

Diopside from this location was described in 1930.


Field of view: 50 mm. Diopside in skarn. The opaque white rectangles are cross sections of tabular diopside. The fien brown grains are grossular. The translucent gray matrix is calcite.

Other localities

  • Chichibu Mine (Skarn, White)
  • Kasuga Mine (Skarn, White)
  • Horado Mine (Skarn, Green)
  • Ishibaiyama (Dolomite Skarn, Granular)
  • Mount Hiiragi (Dolomite Skarn, Granular)
  • Kami-Sano (Basalt, Green)
  • Arai (Serpentinite, Prismatic)
  • Kamioka Mine (Migmatite, Tabular)
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