data_[Na2Cu2Si4O11]
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 [P-1]
_cell_length_a [5.2406]
_cell_length_b [6.3741]
_cell_length_c [8.4565]
_cell_angle_alpha [97.3911]
_cell_angle_beta [96.7588]
_cell_angle_gamma [100.5847]
_symmetry_Int_Tables_number [2]
_chemical_formula_structural [Na2Cu2Si4O11]
_chemical_formula_sum '[Na2 Cu2 Si4 O11]'
_cell_volume [272.4546]
_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  0.1282  0.6414  0.8103  1.0
  Si  Si1  2  0.0107  0.1287  0.6799  1.0
  Cu  Cu2  2  0.3012  0.1126  0.0720  1.0
  Si  Si3  2  0.4095  0.6593  0.1877  1.0
  O  O4  2  0.0037  0.0315  0.1870  1.0
  O  O5  2  0.2272  0.7342  0.3249  1.0
  O  O6  2  0.2811  0.4149  0.1084  1.0
  O  O7  2  0.2862  0.3165  0.7202  1.0
  O  O8  2  0.4025  0.8259  0.0535  1.0
  O  O9  1  0.0000  0.0000  0.5000  1.0
]