TrekGEO > Mineral Trail > Kanto region > Tochigi pref. > Dumortierite

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Nasu-Shiobara city, Tochigi pref., Japan


Field of view: 30 mm. Dumortierite associated with pyrophyllite. The massive blue parts are aggregate of fine fibrous dumortierite. The massive white host is aggregate of fine pyrophyllite crystals.

Recovered from a pyrophyllite deposit formed by hydrothermal alteration of rhyolite.

Dumortierite from this location was described in 1982.

Other localities

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