data_[Li4Be2Si2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Li  0.9800  1.4500  0.9000
  Be  1.5700  1.0500  0.5900
  Si  1.9000  1.1000  0.5400
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Pc]
_cell_length_a [4.7398]
_cell_length_b [4.9731]
_cell_length_c [7.7541]
_cell_angle_alpha [90.0000]
_cell_angle_beta [127.6828]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [7]
_chemical_formula_structural [Li2BeSiO4]
_chemical_formula_sum '[Li4 Be2 Si2 O8]'
_cell_volume [144.6511]
_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
[
  Li  Li0  2  0.5021  0.3251  0.0004  1.0
  Li  Li1  2  0.7547  0.1645  0.7528  1.0
  Be  Be2  2  0.2429  0.1802  0.2516  1.0
  Si  Si3  2  0.9938  0.3197  0.5026  1.0
  O  O4  2  0.1151  0.3617  0.0339  1.0
  O  O5  2  0.3005  0.1405  0.7189  1.0
  O  O6  2  0.6174  0.2994  0.4716  1.0
  O  O7  2  0.9285  0.2001  0.2830  1.0
]