data_[Na32Cu8O28]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Cu  1.9000  1.3500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/c]
_cell_length_a [8.6577]
_cell_length_b [11.0746]
_cell_length_c [10.0084]
_cell_angle_alpha [90.0000]
_cell_angle_beta [106.1592]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [14]
_chemical_formula_structural [Na8Cu2O7]
_chemical_formula_sum '[Na32 Cu8 O28]'
_cell_volume [921.6891]
_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  0.0801  0.0399  0.1461  1
  Na  Na1  4  0.1093  0.7406  0.5340  1
  Na  Na2  4  0.1208  0.0222  0.4208  1
  Na  Na3  4  0.2591  0.5518  0.2146  1
  Na  Na4  4  0.2886  0.2494  0.5703  1
  Na  Na5  4  0.3397  0.5040  0.5156  1
  Na  Na6  4  0.4304  0.0248  0.3578  1
  Na  Na7  4  0.4924  0.7323  0.6252  1
  Cu  Cu8  4  0.0928  0.2013  0.7741  1
  Cu  Cu9  4  0.3098  0.7187  0.8468  1
  O  O10  4  0.1005  0.1103  0.6191  1
  O  O11  4  0.1034  0.6936  0.2898  1
  O  O12  4  0.1094  0.1108  0.9356  1
  O  O13  4  0.2523  0.1769  0.3197  1
  O  O14  4  0.3117  0.6122  0.6985  1
  O  O15  4  0.3323  0.6101  0.0054  1
  O  O16  4  0.4578  0.6448  0.3947  1
]