data_global
_chemical_name_mineral 'Columbite'
loop_
_publ_author_name
'Sturdivant J'
_journal_name_full 'Zeitschrift fur Kristallographie'
_journal_volume 75 
_journal_year 1930
_journal_page_first 88
_journal_page_last 108
_publ_section_title
;
 The Crystal Structure of Columbite
 _cod_database_code 1010915
;
_database_code_amcsd 0017641
_chemical_formula_sum 'Fe Nb2 O6'
_cell_length_a 5.082
_cell_length_b 14.238
_cell_length_c 5.73
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 414.609
_exptl_crystal_density_diffrn      5.409
_symmetry_space_group_name_H-M 'P n c a'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '1/2+x,y,-z'
  '1/2-x,-y,z'
  'x,1/2-y,1/2+z'
  '-x,1/2+y,1/2-z'
  '1/2-x,1/2+y,1/2+z'
  '1/2+x,1/2-y,1/2-z'
  '-x,-y,-z'
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
Fe1   0.75000   0.00000   0.60000
Nb1   0.00000   0.16300   0.07500
O1   0.33300   0.09000   0.15500
O2   0.33300   0.41000   0.15000
O3   0.32000   0.75000   0.17000