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 [P-6m2]
_cell_length_a [6.2138]
_cell_length_b [6.2138]
_cell_length_c [9.0141]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [120.0000]
_symmetry_Int_Tables_number [187]
_chemical_formula_structural [RbSrNb]
_chemical_formula_sum '[Rb2 Sr2 Nb2]'
_cell_volume [301.4191]
_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  1  0.3333  0.6667  0.0000  1
  Rb  Rb1  1  0.3333  0.6667  0.5000  1
  Sr  Sr2  2  0.0000  0.0000  0.2882  1
  Nb  Nb3  2  0.6667  0.3333  0.3813  1
]