TrekGEO > Mineral Trail > Kanto region > Tochigi pref. > Cupro-Allophane

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Okorogawa Mine

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


Field of view: 5 mm. A dendritic group of cupro-allophane. Blue allophane is covered with dirt. Allophane is colored blue by Cu contamination. The red parts are limonite.

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,

Cupro-Allophane from this location was described in 1982.

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