AM_Columbite-(Fe)_3 Formula: Fe.462 Mn.476 Sc.045 Ti.116 Sn.004 Ca.001 Nb1.806 Ta.086 W.004 O6 Name: Columbite-(Fe) Unit cell: 14.3267 5.7392 5.0674 90.0 90.0 90.0 , V=416.66 Space group: PBCN (60)

Tarantino S C , Zema M , American Mineralogist , 90 (2005) p.1291-1300, Mixing and ordering behavior in manganocolumbite-ferrocolumbite solid solution:, A single-crystal X-ray diffraction study, Sample: AMB n3 Qm=1 from Ambatofotsikely, Madagascar