data_[Mg6Al3Bi3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Mg  1.3100  1.5000  0.8600
  Al  1.6100  1.2500  0.6750
  Bi  2.0200  1.6000  1.0350
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.2314]
_cell_length_b [5.2314]
_cell_length_c [13.9704]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [Mg2AlBiO6]
_chemical_formula_sum '[Mg6 Al3 Bi3 O18]'
_cell_volume [331.1185]
_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
[
  Mg  Mg0  3  0.0000  0.0000  0.4792  1
  Mg  Mg1  3  0.0000  0.0000  0.9746  1
  Al  Al2  3  0.0000  0.0000  0.1860  1
  Bi  Bi3  3  0.0000  0.0000  0.6876  1
  O  O4  9  0.0003  0.2854  0.0888  1
  O  O5  9  0.0319  0.6915  0.2482  1
]