Nioboixiolite-(Fe3+)
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(Nb0.5Fe3+0.5)O2
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Nioboixiolite-(Fe3+) is a niobium-rich ferric iron-dominant ixiolite-group oxide mineral occurring in oxidized or metamorphosed rare-element granitic pegmatites. It forms black to brownish-black metallic grains and crystals and represents the ferric iron end-member of the niobioixiolite series. The mineral adds to understanding of Fe2+/Fe3+ partitioning in Nb-Ta oxide phases under varying redox conditions.