data_[Be2Tl2Ag2Se4]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Be  1.5700  1.0500  0.5900
  Tl  1.6200  1.9000  1.3325
  Ag  1.9300  1.6000  1.0867
  Se  2.5500  1.1500  1.0133
]
_symmetry_space_group_name_H-M [P2/c]
_cell_length_a [7.3654]
_cell_length_b [5.0350]
_cell_length_c [7.4173]
_cell_angle_alpha [90.0000]
_cell_angle_beta [101.0715]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [13]
_chemical_formula_structural [BeTlAgSe2]
_chemical_formula_sum '[Be2 Tl2 Ag2 Se4]'
_cell_volume [269.9544]
_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
[
  Be  Be0  2  0.0000  0.0000  0.0000  1
  Tl  Tl1  2  0.5000  0.2140  0.2500  1
  Ag  Ag2  2  0.0000  0.4359  0.2500  1
  Se  Se3  4  0.2202  0.2517  0.5586  1
]