data_[Na3Mg9Se12O36]
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
  Se  2.5500  1.1500  1.0133
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R32]
_cell_length_a [10.6575]
_cell_length_b [10.6575]
_cell_length_c [8.1791]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [155]
_chemical_formula_structural [NaMg3(SeO3)4]
_chemical_formula_sum '[Na3 Mg9 Se12 O36]'
_cell_volume [804.5355]
_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  0.0000  1
  Mg  Mg1  9  0.0000  0.5751  0.0000  1
  Se  Se2  9  0.0000  0.4092  0.5000  1
  Se  Se3  3  0.0000  0.0000  0.5000  1
  O  O4  18  0.0443  0.1922  0.2155  1
  O  O5  9  0.0000  0.5703  0.5000  1
  O  O6  9  0.0000  0.8289  0.5000  1
]