data_[Rb2Mg2Tl2Br8]
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
  Tl  1.6200  1.9000  1.3325
  Br  2.9600  1.1500  0.8825
]
_symmetry_space_group_name_H-M [P2_1/m]
_cell_length_a [7.6989]
_cell_length_b [7.7851]
_cell_length_c [9.5274]
_cell_angle_alpha [90.0000]
_cell_angle_beta [108.4113]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [11]
_chemical_formula_structural [RbMgTlBr4]
_chemical_formula_sum '[Rb2 Mg2 Tl2 Br8]'
_cell_volume [541.8097]
_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  0.2705  0.2500  0.0650  1
  Mg  Mg1  2  0.2299  0.7500  0.3073  1
  Tl  Tl2  2  0.2159  0.2500  0.5474  1
  Br  Br3  4  0.0124  0.0004  0.2479  1
  Br  Br4  2  0.4222  0.7500  0.5734  1
  Br  Br5  2  0.4234  0.7500  0.1389  1
]