Piemontite

Asemi River

Uriuno, Motoyama city, nagaoka county, Kochi pref., Japan

Field of view: 30 mm. Prismatic crystals of piemontite. The short dark red prisms are piemontite. The micaceous silver-white crystals exhibiting perfect cleavage are muscovite, and opaque white parts are quartz.

Recovered from piemontite schist in an accretionary complex subjected to Greenschsit facies high-pressure metamorphism. Formed in the Late Cretaceous (100 Ma).

Piemontite from this location was described in 1975.

Other localities

List of Japanese piemontite localities

Asemi River (EA facies, Prismatic)
Nagatoro (GS facies, Prismatic)
Tone Mine (GS facies, Prismatic)
Iwaisawa Mine (PA facies, Prismatic)
Kusama Mine (Zeo facies, Prismatic)