data_[Rb4Np6Se16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Np  1.3600  1.7500  1.0000
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Cmmm]
_cell_length_a [10.3056]
_cell_length_b [17.0834]
_cell_length_c [4.6794]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [65]
_chemical_formula_structural [Rb2Np3Se8]
_chemical_formula_sum '[Rb4 Np6 Se16]'
_cell_volume [823.8236]
_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
[
  Rb  Rb0  4  0.0000  0.2563  0.5000  1
  Np  Np1  4  0.2085  0.5000  0.0000  1
  Np  Np2  2  0.0000  0.0000  0.5000  1
  Se  Se3  8  0.2379  0.0956  0.5000  1
  Se  Se4  4  0.0000  0.0948  0.0000  1
  Se  Se5  4  0.0000  0.3994  0.0000  1
]