data_[Rb2Mn2Nb2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Mn  1.5500  1.4000  0.6483
  Nb  1.6000  1.4500  0.8200
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [5.8314]
_cell_length_b [6.1302]
_cell_length_c [8.4219]
_cell_angle_alpha [90.0000]
_cell_angle_beta [92.5478]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [RbMnNbO4]
_chemical_formula_sum '[Rb2 Mn2 Nb2 O8]'
_cell_volume [300.7613]
_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  0.1991  0.2500  0.9608  1.0
  Mn  Mn1  2  0.1209  0.2500  0.4771  1.0
  Nb  Nb2  2  0.3286  0.7500  0.7255  1.0
  O  O3  4  0.1618  0.5107  0.6350  1.0
  O  O4  2  0.2899  0.7500  0.9409  1.0
  O  O5  2  0.3555  0.2500  0.3057  1.0
]