data_[Rb8Zn4Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Zn  1.6500  1.3500  0.8800
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Cmc2_1]
_cell_length_a [4.2454]
_cell_length_b [21.5432]
_cell_length_c [7.6988]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [36]
_chemical_formula_structural [Rb2ZnSe2]
_chemical_formula_sum '[Rb8 Zn4 Se8]'
_cell_volume [704.1395]
_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  0.0000  0.0272  0.3009  1.0
  Rb  Rb1  4  0.0000  0.1981  0.5153  1.0
  Zn  Zn2  4  0.0000  0.3689  0.3917  1.0
  Se  Se3  4  0.0000  0.1651  0.0359  1.0
  Se  Se4  4  0.0000  0.4203  0.1218  1.0
]