data_global
_chemical_name_mineral 'Tapiolite-(Fe)'
loop_
_publ_author_name
'von Heidenstam O'
_journal_name_full 'Arkiv for Kemi'
_journal_volume 28 
_journal_year 1968
_journal_page_first 375
_journal_page_last 387
_publ_section_title
;
 Neutron and X-ray diffraction studies on tapiolite and
 some synthetic substances of trirutile structure
 Note: Crystal A and B combined
;
_database_code_amcsd 0017875
_chemical_formula_sum 'Fe (Nb.2 Ta1.8) O6'
_cell_length_a 4.7515
_cell_length_b 4.7515
_cell_length_c 9.254
_cell_angle_alpha 90
_cell_angle_beta 90
_cell_angle_gamma 90
_cell_volume 208.925
_exptl_crystal_density_diffrn      7.887
_symmetry_space_group_name_H-M 'P 42/m n m'
loop_
_space_group_symop_operation_xyz
  'x,y,z'
  '-y,-x,z'
  'y,x,-z'
  '1/2+y,1/2-x,1/2-z'
  '1/2-y,1/2+x,1/2+z'
  '1/2+x,1/2-y,1/2+z'
  '1/2-x,1/2+y,1/2-z'
  'x,y,-z'
  '-x,-y,z'
  'y,x,z'
  '-y,-x,-z'
  '1/2-y,1/2+x,1/2-z'
  '1/2+y,1/2-x,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
_atom_site_occupancy
_atom_site_U_iso_or_equiv
Fe   0.00000   0.00000   0.00000   1.00000   0.01406
Nb   0.00000   0.00000   0.33290   0.10000   0.01279
Ta   0.00000   0.00000   0.33290   0.90000   0.01279
O1   0.30300   0.30300   0.00000   1.00000   0.00975
O2   0.29860   0.29860   0.32980   1.00000   0.01203