AM_Columbite-(Fe) Formula: (Nb.501 Ta.166 Fe.333) O2 Name: Columbite-(Fe) Unit cell: 14.189 5.727 5.12 90.0 90.0 90.0 , V=416.05 Space group: PBCN (60)

Wenger M , Armbruster T , Geiger C A , American Mineralogist , 76 (1991) p.1897-1904, Cation distribution in partially ordered columbite from the Kings Mountain, pegmatite, North Carolina, sample NCP5, T = 100 K