data_[Rb2Sr2Nb2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Sr  0.9500  2.0000  1.3200
  Nb  1.6000  1.4500  0.8200
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [3.7596]
_cell_length_b [3.7594]
_cell_length_c [17.7967]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.5236]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [RbSrNb]
_chemical_formula_sum '[Rb2 Sr2 Nb2]'
_cell_volume [251.5280]
_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  0.2406  0.7500  0.6204  1
  Sr  Sr1  2  0.2571  0.7500  0.1597  1
  Nb  Nb2  2  0.2487  0.7500  0.9729  1
]