data_[K2Rb4Cr2O8]
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
  Cr  1.6600  1.4000  0.9400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Pmmn]
_cell_length_a [6.2670]
_cell_length_b [8.2737]
_cell_length_c [6.4484]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [59]
_chemical_formula_structural [KRb2CrO4]
_chemical_formula_sum '[K2 Rb4 Cr2 O8]'
_cell_volume [334.3578]
_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  4  0.0000  0.2549  0.7770  1.0
  K  K1  2  0.0000  0.5000  0.2568  1.0
  Cr  Cr2  2  0.0000  0.0000  0.2059  1.0
  O  O3  4  0.0000  0.1777  0.3446  1.0
  O  O4  4  0.2235  0.0000  0.0446  1.0
]