AM_Manganocolumbite_12 Formula: Mn.792 Fe.138 Ti.077 Nb1.794 Ta.166 Ca.009 Sn.003 Sc.002 W.001 O6 Name: Manganocolumbite Unit cell: 14.4508 5.7741 5.1025 90.0 90.0 90.0 , V=425.75 Space group: PBCN (60)

Tarantino S C , Zema M , Pistorino M , Domeneghetti M C , Physics and Chemistry of Minerals , 30 (2003) p.590-598, High-temperature X-ray investigation of natural columbites, Note: sample KRA5 at T = 600 C, Sample: Kragero, Norway