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Allophane

Mikawa Mine

Araya, Aga city, Higashi-Kambara county, Niigata pref., Japan

Allophane

Field of view: 5 mm. A botryoidal crust of light gray allophane.

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

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