data_[Rb2Al2Cr2Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Al  1.6100  1.2500  0.6750
  Cr  1.6600  1.4000  0.9400
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [6.4954]
_cell_length_b [6.8677]
_cell_length_c [8.7358]
_cell_angle_alpha [90.0000]
_cell_angle_beta [94.3112]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [RbAlCrSe4]
_chemical_formula_sum '[Rb2 Al2 Cr2 Se8]'
_cell_volume [388.5849]
_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  0.2741  0.2500  0.9428  1
  Al  Al1  2  0.1461  0.2500  0.3597  1
  Cr  Cr2  2  0.3338  0.7500  0.5376  1
  Se  Se3  4  0.4115  0.0030  0.3282  1
  Se  Se4  2  0.0060  0.2500  0.6005  1
  Se  Se5  2  0.1646  0.7500  0.8003  1
]