data_[K6Rb3V6O21]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Rb  0.8200  2.3500  1.6600
  V  1.6300  1.3500  0.7775
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [R32]
_cell_length_a [6.6195]
_cell_length_b [6.6195]
_cell_length_c [23.9704]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [155]
_chemical_formula_structural [K2RbV2O7]
_chemical_formula_sum '[K6 Rb3 V6 O21]'
_cell_volume [909.6153]
_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
[
  K  K0  6  0.0000  0.0000  0.2200  1
  Rb  Rb1  3  0.0000  0.0000  0.5000  1
  V  V2  6  0.0000  0.0000  0.0757  1
  O  O3  18  0.0223  0.2515  0.1023  1
  O  O4  3  0.0000  0.0000  0.0000  1
]