TrekGEO > Mineral Trail > Kanto region > Saitama pref. > Andradite

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Chichibu Mine

Otaki, Chichibu city, Saitama pref., Japan


Field of view: 30 mm. Andradite associated with magnetite. The dodecahedral grayish-green crystals are andradite. The fine black grains in the interstices of andradite are magnetite.

Recovered from a moderately low-temperature hydrothermal deposit combined with skarn formed by contact metamorphism of I-type (magnetite-series) quartz diorite. Formed in the late Miocene (6 Ma).

Andradite from this location was described in 1918 as garnet and in 1930 as andradite.

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