TrekGEO > Mineral Trail > Kanto region > Gunma pref. > Augite

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Akima river

Nishikami-Akima, Annaka city, Gunma pref., Japan


Upper left crystal: 5 mm. Dispatched augite crystals. Short prisms.

Recovered from tuff breccia of Akima Formation erupted from a terrestrial volcano. Formed in the late Miocene (6.5 Ma).

Augite from this location was described as pyroxene in 1978.

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