data_[Na4Ca4W4O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Ca  1.0000  1.8000  1.1400
  W  2.3600  1.3500  0.7667
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Imma]
_cell_length_a [6.5777]
_cell_length_b [6.9210]
_cell_length_c [8.6803]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [74]
_chemical_formula_structural [NaCaWO4]
_chemical_formula_sum '[Na4 Ca4 W4 O16]'
_cell_volume [395.1686]
_cell_formula_units_Z [4]
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  0.2500  0.2500  0.7500  1
  Ca  Ca1  4  0.0000  0.0000  0.0000  1
  W  W2  4  0.0000  0.2500  0.3777  1
  O  O3  8  0.0000  0.0090  0.2761  1
  O  O4  8  0.2408  0.2500  0.0212  1
]