data_[Pm4Si4Hg4O16]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [11.5854]
_cell_length_b [6.2722]
_cell_length_c [6.9653]
_cell_angle_alpha [90.0000]
_cell_angle_beta [101.4322]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [PmSiHgO4]
_chemical_formula_sum '[Pm4 Si4 Hg4 O16]'
_cell_volume [496.1048]
_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  4  0.1958  0.5000  0.8491  1
  Si  Si1  4  0.1360  0.5000  0.2645  1
  Hg  Hg2  4  0.1095  0.0000  0.4913  1
  O  O3  8  0.1837  0.2962  0.1487  1
  O  O4  4  0.0037  0.5000  0.7453  1
  O  O5  4  0.2050  0.5000  0.5005  1
]