TrekGEO > Mineral Trail > Koshinetsu region > Nagano pref. > Augite

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Mount Hijiri

Oka-Otsu, Nagano city, Nagano pref., Japan


Field of view: 20 mm. Dispatched augite phenocrysts of andesite.

Recovered from weathered andesite erupted from a submarine volcano. Formed in the late Miocene (5.4 Ma).

Augite from this location was described in 1917.

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