Rhodonite
Nippara, Okutama city, Nishi-tama county, Tokyo, Japan
Source for manganese
Field of view: 50 mm. Massive rhodonite. The massive pink part is aggregate of fine rhodonite crystals. The massive grayish-purple parts contacting rhodonite are fine spessartine crystals. The grayish-green to gray host is chert. The black crusts at the right are manganese dioxide formed by weathering.
Recovered from a chert-hosted bedded manganese deposit subjected to weak Prehnite-Pumpellyite to Zeolite facies metamorphism.
Rhodonite from this location was described in 1973.
Other localities
- Hagidaira Mine (Mn skarn, Tabular)
- Higashizawa Mine (Mn skarn, Prismatic)
- Kyurazawa Mine (Mn skarn, Fe-rich)
- Mogurazawa Mine (Mn skarn, Purple and Pink)
- Takanosu Mine (Mn skarn, Banded)
- Kurokawa Mine (Mn skarn, Massive)
- Kanoiri Mine (Mn skarn, Massive)
- Gozaisho Mine (Bedded Mn, EA facies)
- Kiyokawa Mine (Bedded Mn, Zeo facies)