data_[K2Rb2Ag4Se4]
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
  Ag  1.9300  1.6000  1.0867
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [Amm2]
_cell_length_a [6.6933]
_cell_length_b [6.7934]
_cell_length_c [8.4933]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [38]
_chemical_formula_structural [KRb(AgSe)2]
_chemical_formula_sum '[K2 Rb2 Ag4 Se4]'
_cell_volume [386.1935]
_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
[
  K  K0  2  0.0000  0.0000  0.6371  1
  Rb  Rb1  2  0.5000  0.0000  0.3700  1
  Ag  Ag2  4  0.2490  0.0000  0.9979  1
  Se  Se3  2  0.0000  0.0000  0.2176  1
  Se  Se4  2  0.5000  0.0000  0.7795  1
]