data_[Rb4Np2Sb2Se8]
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
  Sb  2.0500  1.4500  0.8300
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [I-4]
_cell_length_a [8.0194]
_cell_length_b [8.0194]
_cell_length_c [9.9901]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [82]
_chemical_formula_structural [Rb2NpSbSe4]
_chemical_formula_sum '[Rb4 Np2 Sb2 Se8]'
_cell_volume [642.4675]
_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  2  0.0000  0.0000  0.0000  1
  Rb  Rb1  2  0.0000  0.5000  0.7500  1
  Np  Np2  2  0.0000  0.5000  0.2500  1
  Sb  Sb3  2  0.0000  0.0000  0.5000  1
  Se  Se4  8  0.1822  0.7514  0.3752  1
]