data_[K4Be4O6]
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
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Immm]
_cell_length_a [2.8440]
_cell_length_b [7.9432]
_cell_length_c [8.2846]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [71]
_chemical_formula_structural [K2Be2O3]
_chemical_formula_sum '[K4 Be4 O6]'
_cell_volume [187.1503]
_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  4  0.0000  0.2938  0.5000  1
  Be  Be1  4  0.0000  0.5000  0.1839  1
  O  O2  4  0.0000  0.0000  0.2228  1
  O  O3  2  0.0000  0.5000  0.0000  1
]