data_[Pm8Si4Te20]
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
  Te  2.1000  1.4000  1.2933
]
_symmetry_space_group_name_H-M [Cmcm]
_cell_length_a [6.2314]
_cell_length_b [14.9421]
_cell_length_c [13.4998]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [63]
_chemical_formula_structural [Pm2SiTe5]
_chemical_formula_sum '[Pm8 Si4 Te20]'
_cell_volume [1256.9679]
_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  0.1717  0.5758  1
  Si  Si1  4  0.0000  0.1911  0.2500  1
  Te  Te2  8  0.0000  0.0351  0.1018  1
  Te  Te3  8  0.0000  0.3095  0.1006  1
  Te  Te4  4  0.0000  0.3055  0.7500  1
]