data_[Ba3Mg3O6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ba  0.8900  2.1500  1.4900
  Mg  1.3100  1.5000  0.8600
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P3_121]
_cell_length_a [5.9754]
_cell_length_b [5.9754]
_cell_length_c [6.8385]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [152]
_chemical_formula_structural [BaMgO2]
_chemical_formula_sum '[Ba3 Mg3 O6]'
_cell_volume [211.4619]
_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  0.3463  0.1667  1.0
  Mg  Mg1  3  0.0000  0.4252  0.6667  1.0
  O  O2  6  0.1310  0.7024  0.4599  1.0
]