TrekGEO > Mineral Trail > Kanto region > Ibaraki pref. > Columbite-(Fe)

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Yukiiri, Kasumigaura city, Ibaraki pref., Japan

This locality is in a park.


Field of view: 50 mm. Columbite-(Fe) in pegmatite. The tabular black crystals are columbite-(Fe). The opaque white parts are feldspar, and the translucent gray parts are quartz. The brown parts are dirt by limonite.

Recovered from a beryl-columbite-phosphate subtype rare-element pegmatite associated with S-type (Ilmenite-series) granite. Formed in the middle Paleocene (60 Ma).

Columbite-(Fe) from this location was described in 1980.

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