data_[Rb2Sr4Cr4]
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
  Cr  1.6600  1.4000  0.9400
]
_symmetry_space_group_name_H-M [I4/mmm]
_cell_length_a [6.3035]
_cell_length_b [6.3035]
_cell_length_c [9.7180]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [Rb(SrCr)2]
_chemical_formula_sum '[Rb2 Sr4 Cr4]'
_cell_volume [386.1330]
_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  0.0000  0.0000  0.0000  1
  Sr  Sr1  4  0.0000  0.5000  0.2500  1
  Cr  Cr2  4  0.0000  0.0000  0.4110  1
]