data_[Tl4Cr2Si2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Tl  1.6200  1.9000  1.3325
  Cr  1.6600  1.4000  0.9400
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Pmn2_1]
_cell_length_a [6.7028]
_cell_length_b [8.3395]
_cell_length_c [5.4259]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [31]
_chemical_formula_structural [Tl2CrSiO4]
_chemical_formula_sum '[Tl4 Cr2 Si2 O8]'
_cell_volume [303.3001]
_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
[
  Tl  Tl0  4  0.2420  0.6909  0.5094  1
  Cr  Cr1  2  0.0000  0.1151  0.5060  1
  Si  Si2  2  0.0000  0.9103  0.9987  1
  O  O3  4  0.2075  0.8212  0.0889  1
  O  O4  2  0.0000  0.0994  0.1054  1
  O  O5  2  0.0000  0.9065  0.6934  1
]