data_[Na14Sr2Bi8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Sr  0.9500  2.0000  1.3200
  Bi  2.0200  1.6000  1.0350
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [14.4869]
_cell_length_b [5.8145]
_cell_length_c [11.9836]
_cell_angle_alpha [90.0000]
_cell_angle_beta [127.1347]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Na7SrBi4]
_chemical_formula_sum '[Na14 Sr2 Bi8]'
_cell_volume [804.7258]
_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  0.0839  0.0000  0.3723  1
  Na  Na1  4  0.1562  0.5000  0.5850  1
  Na  Na2  4  0.2147  0.0000  0.8848  1
  Na  Na3  2  0.0000  0.5000  0.0000  1
  Sr  Sr4  2  0.0000  0.0000  0.0000  1
  Bi  Bi5  4  0.0635  0.5000  0.7803  1
  Bi  Bi6  4  0.1929  0.5000  0.3004  1
]