data_[Rb4Er4Si8O24]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Er  1.2400  1.7500  1.0300
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [10.3480]
_cell_length_b [9.8896]
_cell_length_c [5.5193]
_cell_angle_alpha [90.0000]
_cell_angle_beta [102.1883]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [RbEr(SiO3)2]
_chemical_formula_sum '[Rb4 Er4 Si8 O24]'
_cell_volume [552.1022]
_cell_formula_units_Z [4]
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
[
  Rb  Rb0  4  0.0000  0.1811  0.7500  1
  Er  Er1  4  0.0000  0.3854  0.2500  1
  Si  Si2  8  0.2207  0.0817  0.2989  1
  O  O3  8  0.1173  0.4330  0.6339  1
  O  O4  8  0.1509  0.2281  0.2478  1
  O  O5  8  0.1686  0.0082  0.5362  1
]