data_[Na4Cu4Si4O12]
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
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Pnma]
_cell_length_a [10.2622]
_cell_length_b [2.7444]
_cell_length_c [9.0875]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [62]
_chemical_formula_structural [NaCuSiO3]
_chemical_formula_sum '[Na4 Cu4 Si4 O12]'
_cell_volume [255.9324]
_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  0.2348  0.7500  0.8586  1
  Si  Si1  4  0.0182  0.7500  0.6337  1
  Cu  Cu2  4  0.0390  0.7500  0.0911  1
  O  O3  4  0.0869  0.7500  0.4527  1
  O  O4  4  0.0907  0.2500  0.2190  1
  O  O5  4  0.1117  0.2500  0.6975  1
]