Yoshimuraite
Yatsuhashi, Shitara city, Kita-Shitara county, Aichi pref., Japan
This locality is strictly closed to collecting.
Field of view: 10 mm. Yoshimuraite associated with richterite. The platy translucent brown crystal exhibiting cleavage along the basal plane is yoshimuraite. The black to dark green grains are richterite. The transparent parts with a vitreous luster are quartz. The pink parts at the bottom are rhodonite. Its appearance is similar to phlogopite but phlogopite is not associated with richterite.
Recovered from a bedded manganese deposit in pelitic schist subjected to Amphibolite facies regional metamorphism and contact metamorphism by granodiorite. The Rb-Sr radiometric dating of Yoshimuraite-Rhodonite-Phlogopite ores indicates 71-80 Ma.
Yoshimuraite from this location was described in 1961.
Other localities
- Taguchi Mine (Bedded Mn, Platy)
- Tanohata Mine (Bedded Mn, Platy)