data_RbO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   4.7
_cell_length_b   4.7
_cell_length_c   5.41
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   1
_chemical_formula_structural   RbO2
_chemical_formula_sum   'Rb2 O4'
_cell_volume   119.25
_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  Rb4  1  0.0  0.0  0.0  1.0
  Rb  Rb5  1  0.35  0.35  0.7  1.0
  O  O0  1  0.87  0.87  0.0  1.0
  O  O1  1  0.82  0.82  0.0  1.0
  O  O2  1  0.22  0.47  0.7  1.0
  O  O3  1  0.47  0.22  0.7  1.0

data_RbO2
_symmetry_space_group_name_H-M   Cm
_cell_length_a   6.64
_cell_length_b   6.64
_cell_length_c   5.41
_cell_angle_alpha   90.0
_cell_angle_beta   90.0
_cell_angle_gamma   90.0
_symmetry_Int_Tables_number   8
_chemical_formula_structural   RbO2
_chemical_formula_sum   'Rb4 O8'
_cell_volume   238.5
_cell_formula_units_Z   4
loop_
 _symmetry_equiv_pos_site_id
 _symmetry_equiv_pos_as_xyz
  1  'x, y, z'
  2  'x, -y, z'
  3  'x+1/2, y+1/2, z'
  4  'x+1/2, -y+1/2, 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  0.0  0.0  0.0  1.0
  Rb  Rb1  2  0.35  0.0  0.7  1.0
  O  O2  4  0.35  0.13  0.7  1.0
  O  O3  2  0.32  0.5  0.0  1.0
  O  O4  2  0.37  0.5  0.0  1.0

Rb Rb O O O O