Columbite-(Fe)
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.