data_[Rb8Nb8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Nb  1.6000  1.4500  0.8200
]
_symmetry_space_group_name_H-M [P4/m]
_cell_length_a [13.3905]
_cell_length_b [13.3905]
_cell_length_c [4.9661]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [83]
_chemical_formula_structural [RbNb]
_chemical_formula_sum '[Rb8 Nb8]'
_cell_volume [890.4526]
_cell_formula_units_Z [8]
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  0.1359  0.3960  0.0000  1
  Rb  Rb1  4  0.1671  0.6933  0.5000  1
  Nb  Nb2  4  0.3653  0.4635  0.5000  1
  Nb  Nb3  4  0.3784  0.5687  0.0000  1
]