data_[Na7Cu3O8]
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 [P-1]
_cell_length_a [5.6439]
_cell_length_b [6.1448]
_cell_length_c [7.9671]
_cell_angle_alpha [70.1017]
_cell_angle_beta [71.6119]
_cell_angle_gamma [89.7820]
_symmetry_Int_Tables_number [2]
_chemical_formula_structural [Na7Cu3O8]
_chemical_formula_sum '[Na7 Cu3 O8]'
_cell_volume [244.8760]
_cell_formula_units_Z [1]
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  2  0.2537  0.3673  0.0573  1.0
  Na  Na1  2  0.2823  0.3913  0.6167  1.0
  Na  Na2  2  0.3788  0.8398  0.7106  1.0
  Na  Na3  1  0.0000  0.0000  0.5000  1.0
  Cu  Cu4  2  0.2554  0.7506  0.2389  1.0
  Cu  Cu5  1  0.0000  0.0000  0.0000  1.0
  O  O6  2  0.0382  0.9900  0.2226  1.0
  O  O7  2  0.1299  0.7181  0.0516  1.0
  O  O8  2  0.3503  0.8075  0.4222  1.0
  O  O9  2  0.4319  0.5001  0.2469  1.0
]