data_[K2Si2Bi2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Si  1.9000  1.1000  0.5400
  Bi  2.0200  1.6000  1.0350
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [6.0074]
_cell_length_b [5.8172]
_cell_length_c [7.3261]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.0812]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [KSiBiO4]
_chemical_formula_sum '[K2 Si2 Bi2 O8]'
_cell_volume [243.3750]
_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  0.3087  0.7500  0.0558  1.0
  Si  Si1  2  0.2596  0.2500  0.3249  1.0
  Bi  Bi2  2  0.2248  0.7500  0.5234  1.0
  O  O3  4  0.0853  0.0226  0.2981  1.0
  O  O4  2  0.4280  0.2500  0.1876  1.0
  O  O5  2  0.4426  0.2500  0.5508  1.0
]