The structure described by Sn3SO7 crystallizes in the orthorhombic Pca2_1 space group. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), and one O(6) atom. In the second Sn site, Sn(2) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form SnO4 tetrahedra that share  a cornercorner with one S(1)O4 tetrahedra. In the third Sn site, Sn(3) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), one O(6), and one O(7) atom. S(1) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form SO4 tetrahedra that share  a cornercorner with one Sn(2)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one Sn(2) and one S(1) atom. In the second O site, O(6) is bonded in a distorted single-bond geometry to one Sn(1), one Sn(3), and one S(1) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one Sn(3) and one S(1) atom. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to one Sn(1) and one Sn(2) atom. In the fifth O site, O(2) is bonded in a bent 120 degrees geometry to one Sn(2) and one Sn(3) atom. In the sixth O site, O(3) is bonded in a trigonal non-coplanar geometry to one Sn(1), one Sn(2), and one Sn(3) atom. In the seventh O site, O(4) is bonded in a bent 120 degrees geometry to one Sn(1) and one S(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sn3SO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.797
_cell_length_b   12.219
_cell_length_c   13.358
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   946.122
_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
  Sn  Sn0  1  0.937  0.994  0.811  1.0
  Sn  Sn1  1  0.063  0.494  0.189  1.0
  Sn  Sn2  1  0.937  0.494  0.689  1.0
  Sn  Sn3  1  0.063  0.994  0.311  1.0
  Sn  Sn4  1  0.437  0.853  0.886  1.0
  Sn  Sn5  1  0.563  0.353  0.114  1.0
  Sn  Sn6  1  0.437  0.353  0.614  1.0
  Sn  Sn7  1  0.563  0.853  0.386  1.0
  Sn  Sn8  1  0.940  0.752  1.000  1.0
  Sn  Sn9  1  0.060  0.252  0.000  1.0
  Sn  Sn10  1  0.940  0.252  0.500  1.0
  Sn  Sn11  1  0.060  0.752  0.500  1.0
  S  S12  1  0.746  0.482  0.929  1.0
  S  S13  1  0.254  0.982  0.071  1.0
  S  S14  1  0.746  0.982  0.571  1.0
  S  S15  1  0.254  0.482  0.429  1.0
  O  O16  1  0.268  0.939  0.788  1.0
  O  O17  1  0.732  0.439  0.212  1.0
  O  O18  1  0.268  0.439  0.712  1.0
  O  O19  1  0.732  0.939  0.288  1.0
  O  O20  1  0.259  0.730  0.936  1.0
  O  O21  1  0.741  0.230  0.064  1.0
  O  O22  1  0.259  0.230  0.564  1.0
  O  O23  1  0.741  0.730  0.436  1.0
  O  O24  1  0.777  0.839  0.870  1.0
  O  O25  1  0.223  0.339  0.130  1.0
  O  O26  1  0.777  0.339  0.630  1.0
  O  O27  1  0.223  0.839  0.370  1.0
  O  O28  1  0.765  0.415  0.836  1.0
  O  O29  1  0.235  0.915  0.164  1.0
  O  O30  1  0.765  0.915  0.664  1.0
  O  O31  1  0.235  0.415  0.336  1.0
  O  O32  1  0.523  0.452  0.983  1.0
  O  O33  1  0.477  0.952  0.017  1.0
  O  O34  1  0.523  0.952  0.517  1.0
  O  O35  1  0.477  0.452  0.483  1.0
  O  O36  1  0.939  0.452  0.999  1.0
  O  O37  1  0.061  0.952  0.001  1.0
  O  O38  1  0.939  0.952  0.501  1.0
  O  O39  1  0.061  0.452  0.499  1.0
  O  O40  1  0.749  0.599  0.905  1.0
  O  O41  1  0.251  0.099  0.095  1.0
  O  O42  1  0.749  0.099  0.595  1.0
  O  O43  1  0.251  0.599  0.405  1.0
[/CIF]
.
The structure described by Sn3SO7 crystallizes in the orthorhombic Pca2_1 space group. There are three inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a 4-coordinate geometry to one O(1), one O(3), one O(4), and one O(6) atom. In the second Sn site, Sn(2) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form SnO4 tetrahedra that share  a cornercorner with one S(1)O4 tetrahedra. In the third Sn site, Sn(3) is bonded in a distorted rectangular see-saw-like geometry to one O(2), one O(3), one O(6), and one O(7) atom. S(1) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form SO4 tetrahedra that share  a cornercorner with one Sn(2)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(5) is bonded in a bent 120 degrees geometry to one Sn(2) and one S(1) atom. In the second O site, O(6) is bonded in a distorted single-bond geometry to one Sn(1), one Sn(3), and one S(1) atom. In the third O site, O(7) is bonded in a distorted single-bond geometry to one Sn(3) and one S(1) atom. In the fourth O site, O(1) is bonded in a bent 120 degrees geometry to one Sn(1) and one Sn(2) atom. In the fifth O site, O(2) is bonded in a bent 120 degrees geometry to one Sn(2) and one Sn(3) atom. In the sixth O site, O(3) is bonded in a trigonal non-coplanar geometry to one Sn(1), one Sn(2), and one Sn(3) atom. In the seventh O site, O(4) is bonded in a bent 120 degrees geometry to one Sn(1) and one S(1) atom. is represented by the Crystallographic Information File (CIF) [CIF]
data_Sn3SO7
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   5.797
_cell_length_b   12.219
_cell_length_c   13.358
_cell_angle_alpha   90.000
_cell_angle_beta   90.000
_cell_angle_gamma   90.000
_symmetry_Int_Tables_number   1
_cell_volume   946.122
_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
  Sn  Sn0  1  0.937  0.994  0.811  1.0
  Sn  Sn1  1  0.063  0.494  0.189  1.0
  Sn  Sn2  1  0.937  0.494  0.689  1.0
  Sn  Sn3  1  0.063  0.994  0.311  1.0
  Sn  Sn4  1  0.437  0.853  0.886  1.0
  Sn  Sn5  1  0.563  0.353  0.114  1.0
  Sn  Sn6  1  0.437  0.353  0.614  1.0
  Sn  Sn7  1  0.563  0.853  0.386  1.0
  Sn  Sn8  1  0.940  0.752  1.000  1.0
  Sn  Sn9  1  0.060  0.252  0.000  1.0
  Sn  Sn10  1  0.940  0.252  0.500  1.0
  Sn  Sn11  1  0.060  0.752  0.500  1.0
  S  S12  1  0.746  0.482  0.929  1.0
  S  S13  1  0.254  0.982  0.071  1.0
  S  S14  1  0.746  0.982  0.571  1.0
  S  S15  1  0.254  0.482  0.429  1.0
  O  O16  1  0.268  0.939  0.788  1.0
  O  O17  1  0.732  0.439  0.212  1.0
  O  O18  1  0.268  0.439  0.712  1.0
  O  O19  1  0.732  0.939  0.288  1.0
  O  O20  1  0.259  0.730  0.936  1.0
  O  O21  1  0.741  0.230  0.064  1.0
  O  O22  1  0.259  0.230  0.564  1.0
  O  O23  1  0.741  0.730  0.436  1.0
  O  O24  1  0.777  0.839  0.870  1.0
  O  O25  1  0.223  0.339  0.130  1.0
  O  O26  1  0.777  0.339  0.630  1.0
  O  O27  1  0.223  0.839  0.370  1.0
  O  O28  1  0.765  0.415  0.836  1.0
  O  O29  1  0.235  0.915  0.164  1.0
  O  O30  1  0.765  0.915  0.664  1.0
  O  O31  1  0.235  0.415  0.336  1.0
  O  O32  1  0.523  0.452  0.983  1.0
  O  O33  1  0.477  0.952  0.017  1.0
  O  O34  1  0.523  0.952  0.517  1.0
  O  O35  1  0.477  0.452  0.483  1.0
  O  O36  1  0.939  0.452  0.999  1.0
  O  O37  1  0.061  0.952  0.001  1.0
  O  O38  1  0.939  0.952  0.501  1.0
  O  O39  1  0.061  0.452  0.499  1.0
  O  O40  1  0.749  0.599  0.905  1.0
  O  O41  1  0.251  0.099  0.095  1.0
  O  O42  1  0.749  0.099  0.595  1.0
  O  O43  1  0.251  0.599  0.405  1.0
[/CIF]
.