AM_Manganocolumbite_1 Formula: Fe.806 Mn.148 Ti.08 Ca.008 Sn.003 Sc.001 Nb1.802 Ta.152 O6 Name: Manganocolumbite Unit cell: 14.4003 5.7501 5.0784 90.0 90.0 90.0 , V=420.51 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: KRA n3p Qm=1 from Kragero, Norway