TrekGEO > Mineral Trail > Shikoku region > Kagawa pref. > Dumortierite

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Nekoyama mine

Nagano, Manno city, Nakatado county, Kagawa pref., Japan


Field of view: 2 mm. Dumortierite associated with pyrophyllite. The massive dark blue part is dumortierite. The surrounding massive white host is aggregate of fine pyrophyllite crystals.

Recovered from a pyrophyllite deposit formed by pyrophyllitization alteration by andesite of granite and associated hornfels in a low-pressure regional metamorphic belt. Formed in the middle Miocene (13 Ma).

Other localities

  • Momura (Pyrophyllite, Fibrous)
  • Kyonosawa (Pyrophyllite, Massive)
  • Shima Mine (Pyrophyllite, Massive)
  • Nekoyama (Pyrophyllite, Massive)
  • Taromaru (High-T metamorphic, Fibrous)
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