data_[K2Er2Be2O6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Er  1.2400  1.7500  1.0300
  Be  1.5700  1.0500  0.5900
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [7.4988]
_cell_length_b [3.3378]
_cell_length_c [7.5924]
_cell_angle_alpha [90.0000]
_cell_angle_beta [107.0531]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [KErBeO3]
_chemical_formula_sum '[K2 Er2 Be2 O6]'
_cell_volume [181.6790]
_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  0.2182  0.2500  0.1908  1.0
  Er  Er1  2  0.1636  0.2500  0.6592  1.0
  Be  Be2  2  0.3959  0.7500  0.9346  1.0
  O  O3  2  0.1455  0.7500  0.4581  1.0
  O  O4  2  0.1782  0.7500  0.8651  1.0
  O  O5  2  0.4668  0.2500  0.8615  1.0
]