AM_Manganocolumbite Formula: Fe.534 Mn.457 Ti.063 Sn.001 Ca.001 Nb1.836 Ta.094 W.014 O6 Name: Manganocolumbite Unit cell: 14.3434 5.7415 5.0665 90.0 90.0 90.0 , V=417.24 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: RIO n5 Qm=1 from Rio Arriba Co., Globe Mine, U.S.A.