data_[K2Rb4Nb4O14]
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 [C2/m]
_cell_length_a [5.8034]
_cell_length_b [5.7937]
_cell_length_c [11.7677]
_cell_angle_alpha [90.0000]
_cell_angle_beta [103.8525]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [KRb2Nb2O7]
_chemical_formula_sum '[K2 Rb4 Nb4 O14]'
_cell_volume [384.1627]
_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  4  0.1945  0.0000  0.3813  1.0
  K  K1  2  0.0000  0.0000  0.0000  1.0
  Nb  Nb2  4  0.1115  0.5000  0.1870  1.0
  O  O3  8  0.1660  0.2497  0.8234  1.0
  O  O4  4  0.1707  0.5000  0.3518  1.0
  O  O5  2  0.0000  0.5000  0.0000  1.0
]