data_[Mg3Ni6Bi3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Mg  1.3100  1.5000  0.8600
  Ni  1.9100  1.3500  0.7400
  Bi  2.0200  1.6000  1.0350
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.2538]
_cell_length_b [5.2538]
_cell_length_c [14.0701]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [MgNi2BiO6]
_chemical_formula_sum '[Mg3 Ni6 Bi3 O18]'
_cell_volume [336.3398]
_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  0.8089  1.0
  Ni  Ni1  3  0.0000  0.0000  0.0159  1.0
  Ni  Ni2  3  0.0000  0.0000  0.5148  1.0
  Bi  Bi3  3  0.0000  0.0000  0.3114  1.0
  O  O4  9  0.0416  0.6868  0.0855  1.0
  O  O5  9  0.0501  0.3597  0.5842  1.0
]