data_[Ba3Cu3O6]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P3_121]
_cell_length_a [5.7903]
_cell_length_b [5.7903]
_cell_length_c [6.9869]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [152]
_chemical_formula_structural [BaCuO2]
_chemical_formula_sum '[Ba3 Cu3 O6]'
_cell_volume [202.8713]
_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  0.3481  0.6667  1.0
  Cu  Cu1  3  0.0000  0.3893  0.1667  1.0
  O  O2  6  0.1459  0.6905  0.9644  1.0
]