data_[Sr2Si2Se4O16]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  Sr  0.9500  2.0000  1.3200
  Si  1.9000  1.1000  0.5400
  Se  2.5500  1.1500  1.0133
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [C2/m]
_cell_length_a [9.2774]
_cell_length_b [5.0453]
_cell_length_c [7.3501]
_cell_angle_alpha [90.0000]
_cell_angle_beta [115.2447]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [12]
_chemical_formula_structural [SrSi(SeO4)2]
_chemical_formula_sum '[Sr2 Si2 Se4 O16]'
_cell_volume [311.1825]
_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
[
  Sr  Sr0  2  0.0000  0.5000  0.5000  1
  Si  Si1  2  0.0000  0.0000  0.0000  1
  Se  Se2  4  0.1801  0.5000  0.1680  1
  O  O3  8  0.0457  0.2540  0.1935  1
  O  O4  4  0.1709  0.0000  0.6018  1
  O  O5  4  0.2069  0.0000  0.0701  1
]