TrekGEO > Mineral Trail > Kanto region > Gunma pref. > Pyrochroite

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Mogurazawa Mine

Kamibishi, Hishi village, Kiryu city, Gunma pref., Japan

Source for manganese


Field of view: 30mm. Pyrochroite associated with hausmannite. The massive group of reddish-brown powder at the bottom is aggregate of fine pyrochroite crystals. The massive dark brown part at the right is aggregate of fine hausmannite crystals. The massive grayish-green part at the left of pyrochroite is aggregate of fine tephroite crystals. The black crusts on the surface of the specimen are manganese dioxide formed by weathering.

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

Pyrochroite from this location was described in 1980.

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