data_[K4Be2F8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Be  1.5700  1.0500  0.5900
  F  3.9800  0.5000  0.7050
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [5.6284]
_cell_length_b [5.8095]
_cell_length_c [7.4478]
_cell_angle_alpha [90.0000]
_cell_angle_beta [107.4173]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [K2BeF4]
_chemical_formula_sum '[K4 Be2 F8]'
_cell_volume [232.3670]
_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  0.1958  0.2500  0.4314  1.0
  K  K1  2  0.3061  0.2500  0.9736  1.0
  Be  Be2  2  0.2825  0.7500  0.2173  1.0
  F  F3  4  0.4543  0.5326  0.2687  1.0
  F  F4  2  0.0851  0.7500  0.3281  1.0
  F  F5  2  0.1575  0.7500  0.9976  1.0
]