data_[Rb8Np4O20]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Pnma]
_cell_length_a [7.9940]
_cell_length_b [6.2029]
_cell_length_c [12.4201]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [62]
_chemical_formula_structural [Rb2NpO5]
_chemical_formula_sum '[Rb8 Np4 O20]'
_cell_volume [615.8608]
_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
[
  Rb  Rb0  4  0.0089  0.7500  0.7681  1
  Rb  Rb1  4  0.1538  0.2500  0.5822  1
  Np  Np2  4  0.1604  0.2500  0.9394  1
  O  O3  8  0.1905  0.5219  0.3842  1
  O  O4  4  0.0000  0.0000  0.0000  1
  O  O5  4  0.0321  0.2500  0.8112  1
  O  O6  4  0.2260  0.7500  0.5752  1
]