data_[K2Na2Be2F8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Na  0.9300  1.8000  1.1600
  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 [4.9330]
_cell_length_b [5.5730]
_cell_length_c [7.2047]
_cell_angle_alpha [90.0000]
_cell_angle_beta [105.5925]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [KNaBeF4]
_chemical_formula_sum '[K2 Na2 Be2 F8]'
_cell_volume [190.7793]
_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  0.2983  0.2500  0.8954  1.0
  Na  Na1  2  0.3143  0.7500  0.5014  1.0
  Be  Be2  2  0.1166  0.2500  0.2929  1.0
  F  F3  4  0.2626  0.0201  0.2416  1.0
  F  F4  2  0.1737  0.2500  0.5196  1.0
  F  F5  2  0.2042  0.7500  0.8033  1.0
]