The structure described by SnO2 crystallizes in the monoclinic Cm space group. There are twelve inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(8) atom to form edge-sharing SnO6 octahedra. In the second Sn site, Sn(2) is bonded to one O(4), one O(9), two equivalent O(5), and two equivalent O(6) atoms to form edge-sharing SnO6 octahedra. In the third Sn site, Sn(3) is bonded to one O(15), one O(7), and two equivalent O(10) atoms to form corner-sharing SnO4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-61°. In the fourth Sn site, Sn(4) is bonded to one O(11), one O(12), one O(14), one O(5), one O(7), and one O(9) atom to form SnO6 octahedra that share  a cornercorner with one Sn(3)O4 tetrahedra, corners with two equivalent Sn(8)O4 tetrahedra,  an edgeedge with one Sn(2)O6 octahedra,  an edgeedge with one Sn(5)O6 octahedra, and edges with two equivalent Sn(4)O6 octahedra. In the fifth Sn site, Sn(5) is bonded to one O(14), one O(2), two equivalent O(5), and two equivalent O(6) atoms to form edge-sharing SnO6 octahedra. In the sixth Sn site, Sn(6) is bonded to one O(13), one O(21), and two equivalent O(17) atoms to form corner-sharing SnO4 tetrahedra. The corner-sharing octahedral tilt angles range from 54-62°. In the seventh Sn site, Sn(7) is bonded to one O(10), one O(13), one O(15), one O(16), one O(18), and one O(20) atom to form SnO6 octahedra that share  a cornercorner with one Sn(6)O4 tetrahedra,  a cornercorner with one Sn(8)O4 tetrahedra, corners with two equivalent Sn(10)O4 tetrahedra, corners with two equivalent Sn(3)O4 tetrahedra, and edges with two equivalent Sn(7)O6 octahedra. In the eighth Sn site, Sn(8) is bonded to one O(11), one O(20), and two equivalent O(12) atoms to form corner-sharing SnO4 tetrahedra. The corner-sharing octahedral tilt angles range from 53-61°. In the ninth Sn site, Sn(9) is bonded to one O(17), one O(19), one O(21), one O(22), one O(23), and one O(24) atom to form SnO6 octahedra that share  a cornercorner with one Sn(10)O4 tetrahedra, corners with two equivalent Sn(6)O4 tetrahedra,  an edgeedge with one Sn(11)O6 octahedra,  an edgeedge with one Sn(12)O6 octahedra, and edges with two equivalent Sn(9)O6 octahedra. In the tenth Sn site, Sn(10) is bonded to one O(16), one O(24), and two equivalent O(18) atoms to form corner-sharing SnO4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-62°. In the eleventh Sn site, Sn(11) is bonded to one O(22), one O(3), two equivalent O(1), and two equivalent O(23) atoms to form edge-sharing SnO6 octahedra. In the twelfth Sn site, Sn(12) is bonded to one O(19), one O(8), two equivalent O(1), and two equivalent O(23) atoms to form edge-sharing SnO6 octahedra. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Sn(1), one Sn(11), and one Sn(12) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Sn(5) and two equivalent Sn(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Sn(11) and two equivalent Sn(1) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Sn(2) and two equivalent Sn(1) atoms. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Sn(2), one Sn(4), and one Sn(5) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Sn(1), one Sn(2), and one Sn(5) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Sn(3) and two equivalent Sn(4) atoms. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Sn(12) and two equivalent Sn(1) atoms. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one Sn(2) and two equivalent Sn(4) atoms. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Sn(3) and one Sn(7) atom. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Sn(8) and two equivalent Sn(4) atoms. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Sn(4) and one Sn(8) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one Sn(6) and two equivalent Sn(7) atoms. In the fourteenth O site, O(14) is bonded in a trigonal non-coplanar geometry to one Sn(5) and two equivalent Sn(4) atoms. In the fifteenth O site, O(15) is bonded in a trigonal planar geometry to one Sn(3) and two equivalent Sn(7) atoms. In the sixteenth O site, O(16) is bonded in a trigonal planar geometry to one Sn(10) and two equivalent Sn(7) atoms. In the seventeenth O site, O(17) is bonded in a bent 120 degrees geometry to one Sn(6) and one Sn(9) atom. In the eighteenth O site, O(18) is bonded in a bent 120 degrees geometry to one Sn(10) and one Sn(7) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal non-coplanar geometry to one Sn(12) and two equivalent Sn(9) atoms. In the twentieth O site, O(20) is bonded in a trigonal planar geometry to one Sn(8) and two equivalent Sn(7) atoms. In the twenty-first O site, O(21) is bonded in a trigonal planar geometry to one Sn(6) and two equivalent Sn(9) atoms. In the twenty-second O site, O(22) is bonded in a trigonal non-coplanar geometry to one Sn(11) and two equivalent Sn(9) atoms. In the twenty-third O site, O(23) is bonded in a distorted trigonal non-coplanar geometry to one Sn(11), one Sn(12), and one Sn(9) atom. In the twenty-fourth O site, O(24) is bonded in a trigonal planar geometry to one Sn(10) and two equivalent Sn(9) atoms. is represented by the CIF file [CIF]
data_SnO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.089
_cell_length_b   6.089
_cell_length_c   20.944
_cell_angle_alpha   79.590
_cell_angle_beta   79.590
_cell_angle_gamma   65.562
_symmetry_Int_Tables_number   1
_cell_volume   690.494
_cell_formula_units_Z   16
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  0.613  0.113  0.123  1.0
  Sn  Sn1  1  0.227  0.227  0.252  1.0
  Sn  Sn2  1  0.113  0.613  0.123  1.0
  Sn  Sn3  1  0.146  0.146  0.533  1.0
  Sn  Sn4  1  0.837  0.341  0.382  1.0
  Sn  Sn5  1  0.727  0.727  0.252  1.0
  Sn  Sn6  1  0.419  0.419  0.778  1.0
  Sn  Sn7  1  0.341  0.837  0.382  1.0
  Sn  Sn8  1  0.125  0.625  0.624  1.0
  Sn  Sn9  1  0.821  0.821  0.473  1.0
  Sn  Sn10  1  0.625  0.125  0.624  1.0
  Sn  Sn11  1  0.898  0.403  0.866  1.0
  Sn  Sn12  1  0.403  0.898  0.866  1.0
  Sn  Sn13  1  0.103  0.103  0.714  1.0
  Sn  Sn14  1  0.998  0.998  0.993  1.0
  Sn  Sn15  1  0.501  0.501  0.994  1.0
  O  O16  1  0.289  0.793  0.051  1.0
  O  O17  1  0.905  0.905  0.180  1.0
  O  O18  1  0.793  0.289  0.051  1.0
  O  O19  1  0.820  0.820  0.065  1.0
  O  O20  1  0.406  0.406  0.180  1.0
  O  O21  1  0.518  0.019  0.309  1.0
  O  O22  1  0.434  0.935  0.194  1.0
  O  O23  1  0.152  0.152  0.436  1.0
  O  O24  1  0.019  0.518  0.309  1.0
  O  O25  1  0.321  0.321  0.065  1.0
  O  O26  1  0.050  0.050  0.326  1.0
  O  O27  1  0.935  0.434  0.194  1.0
  O  O28  1  0.801  0.316  0.564  1.0
  O  O29  1  0.661  0.661  0.432  1.0
  O  O30  1  0.649  0.164  0.443  1.0
  O  O31  1  0.428  0.428  0.680  1.0
  O  O32  1  0.316  0.801  0.564  1.0
  O  O33  1  0.550  0.550  0.325  1.0
  O  O34  1  0.310  0.310  0.573  1.0
  O  O35  1  0.164  0.649  0.443  1.0
  O  O36  1  0.937  0.937  0.676  1.0
  O  O37  1  0.078  0.594  0.809  1.0
  O  O38  1  0.934  0.450  0.686  1.0
  O  O39  1  0.684  0.684  0.924  1.0
  O  O40  1  0.594  0.078  0.809  1.0
  O  O41  1  0.821  0.821  0.569  1.0
  O  O42  1  0.585  0.585  0.814  1.0
  O  O43  1  0.450  0.934  0.686  1.0
  O  O44  1  0.181  0.181  0.924  1.0
  O  O45  1  0.216  0.713  0.935  1.0
  O  O46  1  0.093  0.093  0.811  1.0
  O  O47  1  0.713  0.216  0.935  1.0
[/CIF]
.
The structure described by SnO2 crystallizes in the monoclinic Cm space group. There are twelve inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(6), and one O(8) atom to form edge-sharing SnO6 octahedra. In the second Sn site, Sn(2) is bonded to one O(4), one O(9), two equivalent O(5), and two equivalent O(6) atoms to form edge-sharing SnO6 octahedra. In the third Sn site, Sn(3) is bonded to one O(15), one O(7), and two equivalent O(10) atoms to form corner-sharing SnO4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-61°. In the fourth Sn site, Sn(4) is bonded to one O(11), one O(12), one O(14), one O(5), one O(7), and one O(9) atom to form SnO6 octahedra that share  a cornercorner with one Sn(3)O4 tetrahedra, corners with two equivalent Sn(8)O4 tetrahedra,  an edgeedge with one Sn(2)O6 octahedra,  an edgeedge with one Sn(5)O6 octahedra, and edges with two equivalent Sn(4)O6 octahedra. In the fifth Sn site, Sn(5) is bonded to one O(14), one O(2), two equivalent O(5), and two equivalent O(6) atoms to form edge-sharing SnO6 octahedra. In the sixth Sn site, Sn(6) is bonded to one O(13), one O(21), and two equivalent O(17) atoms to form corner-sharing SnO4 tetrahedra. The corner-sharing octahedral tilt angles range from 54-62°. In the seventh Sn site, Sn(7) is bonded to one O(10), one O(13), one O(15), one O(16), one O(18), and one O(20) atom to form SnO6 octahedra that share  a cornercorner with one Sn(6)O4 tetrahedra,  a cornercorner with one Sn(8)O4 tetrahedra, corners with two equivalent Sn(10)O4 tetrahedra, corners with two equivalent Sn(3)O4 tetrahedra, and edges with two equivalent Sn(7)O6 octahedra. In the eighth Sn site, Sn(8) is bonded to one O(11), one O(20), and two equivalent O(12) atoms to form corner-sharing SnO4 tetrahedra. The corner-sharing octahedral tilt angles range from 53-61°. In the ninth Sn site, Sn(9) is bonded to one O(17), one O(19), one O(21), one O(22), one O(23), and one O(24) atom to form SnO6 octahedra that share  a cornercorner with one Sn(10)O4 tetrahedra, corners with two equivalent Sn(6)O4 tetrahedra,  an edgeedge with one Sn(11)O6 octahedra,  an edgeedge with one Sn(12)O6 octahedra, and edges with two equivalent Sn(9)O6 octahedra. In the tenth Sn site, Sn(10) is bonded to one O(16), one O(24), and two equivalent O(18) atoms to form corner-sharing SnO4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-62°. In the eleventh Sn site, Sn(11) is bonded to one O(22), one O(3), two equivalent O(1), and two equivalent O(23) atoms to form edge-sharing SnO6 octahedra. In the twelfth Sn site, Sn(12) is bonded to one O(19), one O(8), two equivalent O(1), and two equivalent O(23) atoms to form edge-sharing SnO6 octahedra. There are twenty-four inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal non-coplanar geometry to one Sn(1), one Sn(11), and one Sn(12) atom. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Sn(5) and two equivalent Sn(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to one Sn(11) and two equivalent Sn(1) atoms. In the fourth O site, O(4) is bonded in a distorted trigonal non-coplanar geometry to one Sn(2) and two equivalent Sn(1) atoms. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Sn(2), one Sn(4), and one Sn(5) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Sn(1), one Sn(2), and one Sn(5) atom. In the seventh O site, O(7) is bonded in a trigonal planar geometry to one Sn(3) and two equivalent Sn(4) atoms. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Sn(12) and two equivalent Sn(1) atoms. In the ninth O site, O(9) is bonded in a trigonal non-coplanar geometry to one Sn(2) and two equivalent Sn(4) atoms. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Sn(3) and one Sn(7) atom. In the eleventh O site, O(11) is bonded in a trigonal planar geometry to one Sn(8) and two equivalent Sn(4) atoms. In the twelfth O site, O(12) is bonded in a bent 120 degrees geometry to one Sn(4) and one Sn(8) atom. In the thirteenth O site, O(13) is bonded in a trigonal planar geometry to one Sn(6) and two equivalent Sn(7) atoms. In the fourteenth O site, O(14) is bonded in a trigonal non-coplanar geometry to one Sn(5) and two equivalent Sn(4) atoms. In the fifteenth O site, O(15) is bonded in a trigonal planar geometry to one Sn(3) and two equivalent Sn(7) atoms. In the sixteenth O site, O(16) is bonded in a trigonal planar geometry to one Sn(10) and two equivalent Sn(7) atoms. In the seventeenth O site, O(17) is bonded in a bent 120 degrees geometry to one Sn(6) and one Sn(9) atom. In the eighteenth O site, O(18) is bonded in a bent 120 degrees geometry to one Sn(10) and one Sn(7) atom. In the nineteenth O site, O(19) is bonded in a distorted trigonal non-coplanar geometry to one Sn(12) and two equivalent Sn(9) atoms. In the twentieth O site, O(20) is bonded in a trigonal planar geometry to one Sn(8) and two equivalent Sn(7) atoms. In the twenty-first O site, O(21) is bonded in a trigonal planar geometry to one Sn(6) and two equivalent Sn(9) atoms. In the twenty-second O site, O(22) is bonded in a trigonal non-coplanar geometry to one Sn(11) and two equivalent Sn(9) atoms. In the twenty-third O site, O(23) is bonded in a distorted trigonal non-coplanar geometry to one Sn(11), one Sn(12), and one Sn(9) atom. In the twenty-fourth O site, O(24) is bonded in a trigonal planar geometry to one Sn(10) and two equivalent Sn(9) atoms. is represented by the CIF file [CIF]
data_SnO2
_symmetry_space_group_name_H-M   'P 1'
_cell_length_a   6.089
_cell_length_b   6.089
_cell_length_c   20.944
_cell_angle_alpha   79.590
_cell_angle_beta   79.590
_cell_angle_gamma   65.562
_symmetry_Int_Tables_number   1
_cell_volume   690.494
_cell_formula_units_Z   16
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  0.613  0.113  0.123  1.0
  Sn  Sn1  1  0.227  0.227  0.252  1.0
  Sn  Sn2  1  0.113  0.613  0.123  1.0
  Sn  Sn3  1  0.146  0.146  0.533  1.0
  Sn  Sn4  1  0.837  0.341  0.382  1.0
  Sn  Sn5  1  0.727  0.727  0.252  1.0
  Sn  Sn6  1  0.419  0.419  0.778  1.0
  Sn  Sn7  1  0.341  0.837  0.382  1.0
  Sn  Sn8  1  0.125  0.625  0.624  1.0
  Sn  Sn9  1  0.821  0.821  0.473  1.0
  Sn  Sn10  1  0.625  0.125  0.624  1.0
  Sn  Sn11  1  0.898  0.403  0.866  1.0
  Sn  Sn12  1  0.403  0.898  0.866  1.0
  Sn  Sn13  1  0.103  0.103  0.714  1.0
  Sn  Sn14  1  0.998  0.998  0.993  1.0
  Sn  Sn15  1  0.501  0.501  0.994  1.0
  O  O16  1  0.289  0.793  0.051  1.0
  O  O17  1  0.905  0.905  0.180  1.0
  O  O18  1  0.793  0.289  0.051  1.0
  O  O19  1  0.820  0.820  0.065  1.0
  O  O20  1  0.406  0.406  0.180  1.0
  O  O21  1  0.518  0.019  0.309  1.0
  O  O22  1  0.434  0.935  0.194  1.0
  O  O23  1  0.152  0.152  0.436  1.0
  O  O24  1  0.019  0.518  0.309  1.0
  O  O25  1  0.321  0.321  0.065  1.0
  O  O26  1  0.050  0.050  0.326  1.0
  O  O27  1  0.935  0.434  0.194  1.0
  O  O28  1  0.801  0.316  0.564  1.0
  O  O29  1  0.661  0.661  0.432  1.0
  O  O30  1  0.649  0.164  0.443  1.0
  O  O31  1  0.428  0.428  0.680  1.0
  O  O32  1  0.316  0.801  0.564  1.0
  O  O33  1  0.550  0.550  0.325  1.0
  O  O34  1  0.310  0.310  0.573  1.0
  O  O35  1  0.164  0.649  0.443  1.0
  O  O36  1  0.937  0.937  0.676  1.0
  O  O37  1  0.078  0.594  0.809  1.0
  O  O38  1  0.934  0.450  0.686  1.0
  O  O39  1  0.684  0.684  0.924  1.0
  O  O40  1  0.594  0.078  0.809  1.0
  O  O41  1  0.821  0.821  0.569  1.0
  O  O42  1  0.585  0.585  0.814  1.0
  O  O43  1  0.450  0.934  0.686  1.0
  O  O44  1  0.181  0.181  0.924  1.0
  O  O45  1  0.216  0.713  0.935  1.0
  O  O46  1  0.093  0.093  0.811  1.0
  O  O47  1  0.713  0.216  0.935  1.0
[/CIF]
.