data_[Na4Ta2Se4O4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ta  1.5000  1.4500  0.8200
  Se  2.5500  1.1500  1.0133
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [13.1918]
_cell_length_b [3.7172]
_cell_length_c [5.9028]
_cell_angle_alpha [90.0000]
_cell_angle_beta [114.4653]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na2Ta(SeO)2]
_chemical_formula_sum '[Na4 Ta2 Se4 O4]'
_cell_volume [263.4666]
_cell_formula_units_Z [2]
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
loop_
 _atom_site_type_symbol
 _atom_site_label
 _atom_site_symmetry_multiplicity
 _atom_site_fract_x
 _atom_site_fract_y
 _atom_site_fract_z
 _atom_site_occupancy
[
  Na  Na0  4  0.2312  0.0000  0.7723  1
  Ta  Ta1  2  0.0000  0.0000  0.0000  1
  Se  Se2  4  0.0558  0.5000  0.3610  1
  O  O3  4  0.1538  0.0000  0.0645  1
]