Dumortierite

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

List of Japanese dumortierite localities

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