data_[Na3Mg6Os3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Mg  1.3100  1.5000  0.8600
  Os  2.2000  1.3000  0.6730
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.2925]
_cell_length_b [5.2925]
_cell_length_c [14.4357]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [NaMg2OsO6]
_chemical_formula_sum '[Na3 Mg6 Os3 O18]'
_cell_volume [350.1787]
_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
[
  Na  Na0  3  0.0000  0.0000  0.1973  1.0
  Mg  Mg1  3  0.0000  0.0000  0.4780  1.0
  Mg  Mg2  3  0.0000  0.0000  0.9873  1.0
  Os  Os3  3  0.0000  0.0000  0.6756  1.0
  O  O4  9  0.0074  0.3122  0.7430  1.0
  O  O5  9  0.0363  0.6276  0.2572  1.0
]