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Chichibu Mine

Otaki, Chichibu city, Saitama pref., Japan


Field of view: 50 mm. Crystals of ilvaite. The black prisms with a resinous luster are ilvaite. The surrounding translucent white host is gangue quartz.

Recovered from a quartz vein in a moderately low-temperature hydrothermal deposit combined with skarn formed by contact metamorphism of I-type (magnetite-series) quartz diorite. Formed in the late Miocene (6 Ma).

Ilvaite from this location was described in 1954.

Other localities

  • Chichibu Mine (Hydrothermal Skarn, Prismatic)
  • Horado Mine (Hydrothermal Skarn, Granular)
  • Obira Mine (Pneumatolytic Skarn, Prismatic)
  • Kamioka Mine (Pneumatolytic Skarn, Granular)
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