data_[Pm16Si4Hg2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Pm  1.1300  1.8500  1.1100
  Si  1.9000  1.1000  0.5400
  Hg  2.0000  1.5000  1.2450
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [8.7471]
_cell_length_b [13.7518]
_cell_length_c [5.7250]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.9186]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [Pm8Si2Hg]
_chemical_formula_sum '[Pm16 Si4 Hg2]'
_cell_volume [651.4506]
_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  8  0.1965  0.1221  0.0707  1
  Pm  Pm1  4  0.0000  0.2421  0.5000  1
  Pm  Pm2  4  0.0998  0.5000  0.3022  1
  Si  Si3  4  0.0000  0.3076  0.0000  1
  Hg  Hg4  2  0.0000  0.0000  0.5000  1
]