data_[Rb1Ca2Nb3O10]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Ca  1.0000  1.8000  1.1400
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P4/mmm]
_cell_length_a [3.9661]
_cell_length_b [3.9661]
_cell_length_c [15.2833]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [123]
_chemical_formula_structural [RbCa2Nb3O10]
_chemical_formula_sum '[Rb1 Ca2 Nb3 O10]'
_cell_volume [240.4062]
_cell_formula_units_Z [1]
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  1  0.5000  0.5000  0.5000  1.0
  Ca  Ca1  2  0.5000  0.5000  0.1505  1.0
  Nb  Nb2  2  0.0000  0.0000  0.2817  1.0
  Nb  Nb3  1  0.0000  0.0000  0.0000  1.0
  O  O4  4  0.0000  0.5000  0.2538  1.0
  O  O5  2  0.0000  0.0000  0.1296  1.0
  O  O6  2  0.0000  0.0000  0.3996  1.0
  O  O7  2  0.0000  0.5000  0.0000  1.0
]