data_[Na4Ca4Br2]
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
  Br  2.9600  1.1500  0.8825
]
_symmetry_space_group_name_H-M [P4/mbm]
_cell_length_a [7.7404]
_cell_length_b [7.7404]
_cell_length_c [6.4485]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [127]
_chemical_formula_structural [Na2Ca2Br]
_chemical_formula_sum '[Na4 Ca4 Br2]'
_cell_volume [386.3526]
_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  0.1511  0.3489  0.0000  1
  Ca  Ca1  4  0.1667  0.6667  0.5000  1
  Br  Br2  2  0.0000  0.0000  0.0000  1
]