data_[Ca6Er3Bi3O18]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Ca  1.0000  1.8000  1.1400
  Er  1.2400  1.7500  1.0300
  Bi  2.0200  1.6000  1.0350
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R3]
_cell_length_a [5.8102]
_cell_length_b [5.8102]
_cell_length_c [14.9708]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [146]
_chemical_formula_structural [Ca2ErBiO6]
_chemical_formula_sum '[Ca6 Er3 Bi3 O18]'
_cell_volume [437.6798]
_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
[
  Ca  Ca0  3  0.0000  0.0000  0.4667  1
  Ca  Ca1  3  0.0000  0.0000  0.9682  1
  Er  Er2  3  0.0000  0.0000  0.1891  1
  Bi  Bi3  3  0.0000  0.0000  0.6835  1
  O  O4  9  0.0618  0.3465  0.7538  1
  O  O5  9  0.0663  0.7027  0.2565  1
]