data_[Rb2Mg2Cr2Se6]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Rb  0.8200  2.3500  1.6600
  Mg  1.3100  1.5000  0.8600
  Cr  1.6600  1.4000  0.9400
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [8.7643]
_cell_length_b [3.9995]
_cell_length_c [10.2552]
_cell_angle_alpha [90.0000]
_cell_angle_beta [113.3052]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [RbMgCrSe3]
_chemical_formula_sum '[Rb2 Mg2 Cr2 Se6]'
_cell_volume [330.1431]
_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  0.2334  0.2500  0.2461  1.0
  Mg  Mg1  2  0.0911  0.2500  0.6213  1.0
  Cr  Cr2  2  0.3325  0.7500  0.8680  1.0
  Se  Se3  2  0.1368  0.2500  0.8774  1.0
  Se  Se4  2  0.2288  0.7500  0.5580  1.0
  Se  Se5  2  0.4803  0.7500  0.1314  1.0
]