data_[Ba3Cu36Si18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ba  0.8900  2.1500  1.4900
  Cu  1.9000  1.3500  0.8200
  Si  1.9000  1.1000  0.5400
]
_symmetry_space_group_name_H-M [R-3m]
_cell_length_a [11.3104]
_cell_length_b [11.3104]
_cell_length_c [7.6621]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [166]
_chemical_formula_structural [Ba(Cu2Si)6]
_chemical_formula_sum '[Ba3 Cu36 Si18]'
_cell_volume [848.8661]
_cell_formula_units_Z [3]
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
[
  Ba  Ba0  3  0.0000  0.0000  0.0000  1.0
  Cu  Cu1  18  0.0000  0.3261  0.5000  1.0
  Si  Si2  18  0.0658  0.5329  0.3562  1.0
  Cu  Cu3  18  0.0911  0.1822  0.3650  1.0
]