data_[K2Rb6Nb4O10]
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
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Cm]
_cell_length_a [10.2300]
_cell_length_b [6.7833]
_cell_length_c [7.8129]
_cell_angle_alpha [90.0000]
_cell_angle_beta [99.3782]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [8]
_chemical_formula_structural [KRb3Nb2O5]
_chemical_formula_sum '[K2 Rb6 Nb4 O10]'
_cell_volume [534.9130]
_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  0.0002  0.0000  0.0232  1
  K  K1  2  0.1723  0.5000  0.1286  1
  Rb  Rb2  2  0.3147  0.0000  0.8403  1
  Rb  Rb3  2  0.4820  0.5000  0.5131  1
  Nb  Nb4  2  0.1192  0.5000  0.6793  1
  Nb  Nb5  2  0.3954  0.0000  0.3166  1
  O  O6  4  0.0995  0.2753  0.8051  1
  O  O7  4  0.3465  0.2277  0.1949  1
  O  O8  2  0.0811  0.5000  0.4275  1
]