TrekGEO > Mineral Trail > Tokai region > Shizuoka pref. > Birnessite

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Takaneyama Mine

Naka, Shimoda city, Shizuoka pref., Japan

Source for manganese


Field of view: 10 mm. A group of birnessite. The reniform black group is birnessite. The white part at the upper right is gangue quartz. The brown parts are dirt on the surface.

Recovered from a quartz vein of a moderate-temperature hydrothermal deposit associated with andesitic-basaltic pyroclastic rocks of an oceanic arc subjected to propylitization alteration.

Birnessite from this location was described in 1981.

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