data_[Ba6Er3Be6O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ba  0.8900  2.1500  1.4900
  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 [R-3m]
_cell_length_a [5.6858]
_cell_length_b [5.6858]
_cell_length_c [17.1979]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [166]
_chemical_formula_structural [Ba2ErBe2O6]
_chemical_formula_sum '[Ba6 Er3 Be6 O18]'
_cell_volume [481.4892]
_cell_formula_units_Z [3]
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
[
  Ba  Ba0  6  0.0000  0.0000  0.2192  1.0
  Er  Er1  3  0.0000  0.0000  0.0000  1.0
  Be  Be2  6  0.0000  0.0000  0.4184  1.0
  O  O3  18  0.0205  0.5103  0.2518  1.0
]