data_[Na4Si8Ge4O24]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Na  0.9300  1.8000  1.1600
  Si  1.9000  1.1000  0.5400
  Ge  2.0100  1.2500  0.7700
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/c]
_cell_length_a [10.1722]
_cell_length_b [9.7431]
_cell_length_c [5.4394]
_cell_angle_alpha [90.0000]
_cell_angle_beta [109.3816]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [15]
_chemical_formula_structural [NaSi2GeO6]
_chemical_formula_sum '[Na4 Si8 Ge4 O24]'
_cell_volume [508.5412]
_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
[
  Na  Na0  4  0.0000  0.0993  0.2500  1
  Si  Si1  8  0.2140  0.4120  0.2061  1
  Ge  Ge2  4  0.0000  0.2494  0.7500  1
  O  O3  8  0.1162  0.1160  0.6818  1
  O  O4  8  0.1216  0.2728  0.1166  1
  O  O5  8  0.1790  0.4834  0.4528  1
]