data_[Na3Pm3Hg6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Pm  1.1300  1.8500  1.1100
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [R3m]
_cell_length_a [3.7514]
_cell_length_b [3.7514]
_cell_length_c [28.5147]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [160]
_chemical_formula_structural [NaPmHg2]
_chemical_formula_sum '[Na3 Pm3 Hg6]'
_cell_volume [347.5202]
_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  0.5002  1
  Pm  Pm1  3  0.0000  0.0000  0.3332  1
  Hg  Hg2  3  0.0000  0.0000  0.7497  1
  Hg  Hg3  3  0.0000  0.0000  0.9168  1
]