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

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Horaku creek

Toyohashi, Shimo-Suwa city, Suwa county, Nagano pref., Japan


Bottom crystal: 5 mm long. Dispatched augite phenocrysts of andesite. Augite specimens are radial penetration twins.

Recovered from a basalt lava erupted at the early stage of a continental volcano activity. Formed in the early Pleistocene (1.5 Ma).

Augite from this location was described in 1979.

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