Ranciéite
Naka, Shimoda city, Shizuoka pref., Japan
Field of view: 20 mm. Crystals of ranciéite. The platy reddish-brown crystals are ranciéite. The surrounding transparent parts with a vitreous luster are quartz.
Recovered from an open space of a quartz vein in a moderate-temperature hydrothermal deposit associated with andesitic to basaltic pyroclastic rocks of an oceanic arc subjected to propylitization alteration. Formed in the late Miocene (7.5 Ma).
Ranciéite from this location was described in 1981.
Other localities
- Takaneyama Mine (Hydrothermal, Platy)
- Usami (Basalt, Crust)
- Dokura Mine (Mn Skarn, Vein)