data_[Pm16Hg4C8]
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
  C  2.5500  0.7000  0.3000
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [3.8129]
_cell_length_b [12.8368]
_cell_length_c [13.4782]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Pm4HgC2]
_chemical_formula_sum '[Pm16 Hg4 C8]'
_cell_volume [659.6990]
_cell_formula_units_Z [4]
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  8  0.0000  0.2344  0.6024  1
  Pm  Pm1  4  0.0000  0.0802  0.2500  1
  Pm  Pm2  4  0.0000  0.5000  0.0000  1
  Hg  Hg3  4  0.0000  0.3909  0.2500  1
  C  C4  8  0.0000  0.1377  0.0602  1
]