data_[Be4Si4S2]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Be  1.5700  1.0500  0.5900
  Si  1.9000  1.1000  0.5400
  S  2.5800  1.0000  0.8800
]
_symmetry_space_group_name_H-M [I4/mmm]
_cell_length_a [3.3089]
_cell_length_b [3.3089]
_cell_length_c [12.4663]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [139]
_chemical_formula_structural [Be2Si2S]
_chemical_formula_sum '[Be4 Si4 S2]'
_cell_volume [136.4956]
_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  4  0.0000  0.0000  0.4052  1
  Si  Si1  4  0.0000  0.5000  0.2500  1
  S  S2  2  0.0000  0.0000  0.0000  1
]