data_[Ac4Np4Si16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ac  1.1000  1.9500  1.2600
  Np  1.3600  1.7500  1.0000
  Si  1.9000  1.1000  0.5400
]
_symmetry_space_group_name_H-M [Pbam]
_cell_length_a [7.9238]
_cell_length_b [15.3958]
_cell_length_c [4.2414]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [55]
_chemical_formula_structural [AcNpSi4]
_chemical_formula_sum '[Ac4 Np4 Si16]'
_cell_volume [517.4271]
_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
[
  Ac  Ac0  4  0.1187  0.1529  0.0000  1
  Np  Np1  4  0.1230  0.4160  0.0000  1
  Si  Si2  4  0.0283  0.6952  0.5000  1
  Si  Si3  4  0.1256  0.5481  0.5000  1
  Si  Si4  4  0.1261  0.9585  0.5000  1
  Si  Si5  4  0.2234  0.8089  0.5000  1
]