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Kiyokawa Mine

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.

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