TrekGEO > Mineral Trail > Kanto region > Tochigi pref. > Rhodonite

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Kyurazawa Mine

Ashio village, Nikko city, Tochigi pref., Japan

Source for manganese


Field of view: 100 mm. Grayish-brown rhodonite. The massive grayish-brown parts are rhodonite. The grayish-brown color is due to Fe replacing Mn. The massive group of coarse reddish-brown crystals is pyrosmalite-(Mn). The white veins are quartz, and the massive black parts are the host chert.

Recovered from a chert-hosted bedded manganese deposit subjected to Albite-Epidote-hornfels facies contact metamorphism.

Spessartine from this location was described in 1954.

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