data_[Na8Mg2Bi4O12]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Mg  1.3100  1.5000  0.8600
  Bi  2.0200  1.6000  1.0350
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Cm]
_cell_length_a [6.2170]
_cell_length_b [10.3195]
_cell_length_c [6.1596]
_cell_angle_alpha [90.0000]
_cell_angle_beta [110.3328]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [8]
_chemical_formula_structural [Na4Mg(BiO3)2]
_chemical_formula_sum '[Na8 Mg2 Bi4 O12]'
_cell_volume [370.5550]
_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  0.0674  0.2105  0.4913  1
  Na  Na1  2  0.4089  0.0000  0.4507  1
  Na  Na2  2  0.4826  0.5000  0.1001  1
  Mg  Mg3  2  0.3772  0.5000  0.6350  1
  Bi  Bi4  4  0.4871  0.1674  0.9938  1
  O  O5  4  0.2523  0.1852  0.2137  1
  O  O6  4  0.2878  0.3446  0.7813  1
  O  O7  2  0.2069  0.5000  0.2914  1
  O  O8  2  0.2103  0.0000  0.6981  1
]