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

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Okorogawa Mine

Naka-Okorogara, Nikko city, Tochigi pref., Japan


Field of view: 5 mm. Crystals of posnjakite. The platy light blue crystals are posnjakite. The pale brown basement is sandstone, host of the deposit.

Recovered from a meteoric oxidation zone of a moderately high-temperature hydrothermal deposit associated with welded tuff. Formed in less than 50 years after the mine was closed,

The first posnjakite from Japan was reported from this location in 1973.

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