data_[K4Si2Sn2O8]
loop_
 _atom_type_symbol
 _atom_type_electronegativity
 _atom_type_radius
 _atom_type_ionic_radius
[
  K  0.8200  2.2000  1.5200
  Si  1.9000  1.1000  0.5400
  Sn  1.9600  1.4500  0.8300
  O  3.4400  0.6000  1.2600
]
_symmetry_space_group_name_H-M [Pmmn]
_cell_length_a [5.7171]
_cell_length_b [7.7188]
_cell_length_c [6.2113]
_cell_angle_alpha [90.0000]
_cell_angle_beta [90.0000]
_cell_angle_gamma [90.0000]
_symmetry_Int_Tables_number [59]
_chemical_formula_structural [K2SiSnO4]
_chemical_formula_sum '[K4 Si2 Sn2 O8]'
_cell_volume [274.0968]
_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
[
  K  K0  4  0.0000  0.2356  0.2718  1.0
  Si  Si1  2  0.0000  0.5000  0.8533  1.0
  Sn  Sn2  2  0.0000  0.0000  0.7553  1.0
  O  O3  4  0.0000  0.3200  0.7128  1.0
  O  O4  4  0.2369  0.5000  0.0127  1.0
]