TrekGEO > Mineral Trail > Tohoku region > Akita pref. > Chalcopyrite

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Sayama Mine

Ani-Kayakusa, Kita-Akita city, Akita pref., Japan

Source for Copper


Field of view: 3 mm. Chalcopyrite perched on quartz crystals. Two yellow tetrahedra are chalcopyrite. The transparent prisms on the basement are quartz crystals.

Recovered from an open space of a quartz vein of a moderate-temperature hydrothermal deposit in andesitic pyroclastics formed by dacite probably associated with a volcanic activity of a caldera. Formed in the middle Miocene (15 Ma).

Chalcopyrite from this location was described in 1955.

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