AM_Columbite-(Fe)_12
Formula: Fe.791 Mn.209 Nb1.898 Ta.102 O6
Name: Columbite-(Fe)
Unit cell: 14.2852 5.7361 5.0574 90.0 90.0 90.0 , V=414.41
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 n18 Qm=0.988 from S. Jose de Safira, Minas Gerais, Brazil, Sample: Annealed at T = 950 C for t = 3 h, Note: Occupancies calculated assuming complete Fe/Mn disorder