data_[Pm6Hg4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [P4/mbm]
_cell_length_a [8.7712]
_cell_length_b [8.7712]
_cell_length_c [3.8607]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [127]
_chemical_formula_structural [Pm3Hg2]
_chemical_formula_sum '[Pm6 Hg4]'
_cell_volume [297.0164]
_cell_formula_units_Z [2]
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
[
  Pm  Pm0  4  0.1649  0.6649  0.5000  1
  Pm  Pm1  2  0.0000  0.0000  0.0000  1
  Hg  Hg2  4  0.1327  0.3673  0.0000  1
]