data_[Rb2Ca2Cr2O8]
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
  Cr  1.6600  1.4000  0.9400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [5.8574]
_cell_length_b [5.9739]
_cell_length_c [7.5597]
_cell_angle_alpha [90.0000]
_cell_angle_beta [106.2715]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [RbCaCrO4]
_chemical_formula_sum '[Rb2 Ca2 Cr2 O8]'
_cell_volume [253.9267]
_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  0.2778  0.2500  0.0643  1.0
  Ca  Ca1  2  0.1992  0.2500  0.5430  1.0
  Cr  Cr2  2  0.2605  0.7500  0.3433  1.0
  O  O3  4  0.0611  0.5249  0.3182  1.0
  O  O4  2  0.4268  0.7500  0.1901  1.0
  O  O5  2  0.4394  0.7500  0.5621  1.0
]