Pyrophyllite
Nekoyama mine
Nagano, Manno city, Nakatado county, Kagawa pref., Japan
Field of view: 2 mm. Massive pyrophyllite. The group of platy white crystals and massive pale green parts are pyrophyllite. The light brown crusts are limonite.
Recovered from a pyrophyllite deposit formed by pyrophyllitization alteration of granite and associated hornfels in a low-pressure regional metamorphic belt by andesite. Formed in the middle Miocene (13 Ma).
Pyrophyllite from this location was described in 1934.
Other localities
- Nekoyama (Pyrophyllitization, Platy)
- Yoji Mine (Pyrophyllitization, Platy)