AM_Columbite-(Fe)_2 Formula: Fe.202 Mn.767 Ti.036 Sc.001 Ca.001 Sn.001 Nb1.91 Ta.08 W.002 O6 Name: Columbite-(Fe) Unit cell: 14.2877 5.7363 5.0561 90.0 90.0 90.0 , V=414.39 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: BRA n3 Qm=1 from S. Jose de Safira, Minas Gerais, Brazil