Chalcopyrite
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.
Other localities
- Kisan-mori Mine (Hydrothermal, with Galena)
- Mikawa Mine (Hydrothermal, Massive)
- Sayama Mine (Hydrothermal, Tetrahedral)
- Naganobori Mine (Pneumatolytic Skarn, Massive)
- Kusama Mine (Bedded Mn, Massive)