Images The ixiolite group includes: ixiolite-(Fe2+): (Ta2/3Fe2+1/3)O2 ixiolite-(Mn2+): (Ta2/3Mn2+1/3)O2 nioboixiolite-([]): (Nb0.8◻0.2)4+O2 nioboixiolite-(Fe3+): (Nb5+0.5Fe3+0.5)O2 Back to Minerals