data_[Mg4Be4Si8O24]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Mg  1.3100  1.5000  0.8600
  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 [C2/c]
_cell_length_a [9.6054]
_cell_length_b [9.2225]
_cell_length_c [5.2043]
_cell_angle_alpha [90.0000]
_cell_angle_beta [113.2208]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [MgBe(SiO3)2]
_chemical_formula_sum '[Mg4 Be4 Si8 O24]'
_cell_volume [423.6850]
_cell_formula_units_Z [4]
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
[
  Mg  Mg0  4  0.0000  0.1173  0.2500  1.0
  Be  Be1  4  0.0000  0.1977  0.7500  1.0
  Si  Si2  8  0.1939  0.4120  0.1893  1.0
  O  O3  8  0.1020  0.2630  0.0637  1.0
  O  O4  8  0.1182  0.0924  0.6711  1.0
  O  O5  8  0.1490  0.4626  0.4488  1.0
]