TrekGEO > Mineral Trail > Tohoku region > Aomori pref. > Montmorillonite

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Cape Bentenzaki

Kodomari, Nakadomari city, Kita-Tsugaru county, Aomori pref., Japan

Source for bentonite


Field of view: 50 mm. Massive montmorillonite. The network of white veins is pure aggregate of fine montmorillonite crystals. The gray parts contain impurities. The specimen shows that andesite, the protolith, has been altered along fracture networks.

Recovered from andesite subjected to hydrothermal smectitization alteration.

Montmorillonite from this location was described in 1970.

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