Columbite Sturdivant J Zeitschrift fur Kristallographie 75 (1930) 88-108 The Crystal Structure of Columbite _cod_database_code 1010915 _database_code_amcsd 0017641 5.082 14.238 5.73 90 90 90 Pnca atom x y z Fe1 .75 0 .6 Nb1 0 .163 .075 O1 .333 .09 .155 O2 .333 .41 .15 O3 .32 .75 .17