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Rhodochrosite

Chichibu Mine

Otaki, Chichibu city, Saitama pref., Japan

Rhodochrosite

Field of view: 5mm. Rhodochrosite associated with sulfide minerals. The rosette-like group of rhombohedral pink crystals is rhodochrosite. The black parts exhibiting perfect cleavage on the basement are sphalerite, and the massive yellow parts are pyrite.

Recovered from an open space of sulfide minerals in a moderately low-temperature hydrothermal deposit combined with skarn formed by contact metamorphism of I-type (magnetite-series) quartz diorite. Formed in the late Miocene (6 Ma).

Rhodochrosite from this location was described in 1947.

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