data_[Pm4Sn4Hg6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Sn  1.9600  1.4500  0.8300
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [Cmmm]
_cell_length_a [4.2839]
_cell_length_b [21.6392]
_cell_length_c [4.2854]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [65]
_chemical_formula_structural [Pm2Sn2Hg3]
_chemical_formula_sum '[Pm4 Sn4 Hg6]'
_cell_volume [397.2529]
_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  0.0000  0.1593  0.0000  1
  Sn  Sn1  4  0.0000  0.2950  0.5000  1
  Hg  Hg2  4  0.0000  0.4334  0.5000  1
  Hg  Hg3  2  0.0000  0.0000  0.0000  1
]