data_[Na4Ca8Br20]
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 [Cmcm]
_cell_length_a [5.7567]
_cell_length_b [14.2094]
_cell_length_c [14.3635]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [NaCa2Br5]
_chemical_formula_sum '[Na4 Ca8 Br20]'
_cell_volume [1174.9289]
_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  0.0000  0.2087  0.2500  1
  Ca  Ca1  8  0.0000  0.1394  0.5595  1
  Br  Br2  8  0.0000  0.0506  0.1192  1
  Br  Br3  8  0.0000  0.3174  0.0576  1
  Br  Br4  4  0.0000  0.2217  0.7500  1
]