data_[K2Rb2Sb4Se8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Rb  0.8200  2.3500  1.6600
  Sb  2.0500  1.4500  0.8300
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Amm2]
_cell_length_a [3.7791]
_cell_length_b [7.9694]
_cell_length_c [18.6514]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [38]
_chemical_formula_structural [KRb(SbSe2)2]
_chemical_formula_sum '[K2 Rb2 Sb4 Se8]'
_cell_volume [561.7242]
_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  0.5000  0.0000  0.4626  1
  K  K1  2  0.5000  0.0000  0.7026  1
  Sb  Sb2  2  0.5000  0.0000  0.0671  1
  Sb  Sb3  2  0.5000  0.0000  0.8954  1
  Se  Se4  4  0.0000  0.2280  0.8470  1
  Se  Se5  4  0.0000  0.2487  0.0901  1
]