data_[Y4Np4Si4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Y  1.2200  1.8000  1.0400
  Np  1.3600  1.7500  1.0000
  Si  1.9000  1.1000  0.5400
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [10.5923]
_cell_length_b [3.7520]
_cell_length_c [7.9938]
_cell_angle_alpha [90.0000]
_cell_angle_beta [120.5331]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [YNpSi]
_chemical_formula_sum '[Y4 Np4 Si4]'
_cell_volume [273.6358]
_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
[
  Y  Y0  4  0.0842  0.0000  0.3345  1
  Np  Np1  4  0.1933  0.5000  0.0367  1
  Si  Si2  4  0.1244  0.5000  0.6461  1
]