TrekGEO > Mineral Trail > Koshinetsu region > Niigata pref. > Hematite

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Akatani Mine

Higashi-Akatani, Shibata city, Niigata pref., Japan

Source for Iron


Field of view: 50 mm. Groups of hematite. The radial groups of black platy crystals are hematite. The reddish-brown host is metamorphosed limestone containing fine hematite grains.

Recovered from a moderate temperature hydrothermal deposit associated with an oxidative metazomatic zone combined with skarn formed by contact metamorphism of S-type (Ilmenite-series) granodiorite. Formed in the early Miocene (21 Ma).

Hematite from this location was described in 1893.

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