data_[Pm12Si4N2]
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
  N  3.0400  0.6500  0.6300
]
_symmetry_space_group_name_H-M [Immm]
_cell_length_a [4.8608]
_cell_length_b [6.7693]
_cell_length_c [14.1318]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [71]
_chemical_formula_structural [Pm6Si2N]
_chemical_formula_sum '[Pm12 Si4 N2]'
_cell_volume [464.9933]
_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  0.0000  0.2421  0.1571  1
  Pm  Pm1  4  0.0000  0.2671  0.5000  1
  Si  Si2  4  0.0000  0.0000  0.3344  1
  N  N3  2  0.0000  0.0000  0.0000  1
]