data_[Rb4B2O6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  B  2.0400  0.8500  0.4100
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P6_3/mmc]
_cell_length_a [6.2013]
_cell_length_b [6.2013]
_cell_length_c [7.4577]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [194]
_chemical_formula_structural [Rb2BO3]
_chemical_formula_sum '[Rb4 B2 O6]'
_cell_volume [248.3697]
_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
[
  Rb  Rb0  2  0.0000  0.0000  0.0000  1.0
  Rb  Rb1  2  0.3333  0.6667  0.2500  1.0
  B  B2  2  0.3333  0.6667  0.7500  1.0
  O  O3  6  0.2055  0.4110  0.7500  1.0
]