SnO2 crystallizes in the trigonal P3m1 space group. There are six inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(2), one O(6), two equivalent O(1), and two equivalent O(4) atoms to form SnO6 octahedra that share  a cornercorner with one Sn(6)O4 tetrahedra, corners with two equivalent Sn(4)O4 trigonal pyramids, and edges with four equivalent Sn(1)O6 octahedra. In the second Sn site, Sn(2) is bonded to one O(10), one O(5), two equivalent O(3), and two equivalent O(8) atoms to form SnO6 octahedra that share  a cornercorner with one Sn(4)O4 trigonal pyramid,  an edgeedge with one Sn(3)O6 octahedra, and edges with four equivalent Sn(2)O6 octahedra. In the third Sn site, Sn(3) is bonded to three equivalent O(7) and three equivalent O(8) atoms to form edge-sharing SnO6 octahedra. In the fourth Sn site, Sn(4) is bonded to one O(10) and three equivalent O(4) atoms to form corner-sharing SnO4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 58-68°. In the fifth Sn site, Sn(5) is bonded to one O(12), one O(9), two equivalent O(11), and two equivalent O(7) atoms to form SnO6 octahedra that share corners with two equivalent Sn(6)O4 tetrahedra,  an edgeedge with one Sn(3)O6 octahedra, and edges with four equivalent Sn(5)O6 octahedra. In the sixth Sn site, Sn(6) is bonded to one O(6) and three equivalent O(11) atoms to form corner-sharing SnO4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-60°. There are twelve inequivalent O sites. In the first O site, O(11) is bonded in a trigonal planar geometry to one Sn(6) and two equivalent Sn(5) atoms. In the second O site, O(12) is bonded in a trigonal non-coplanar geometry to three equivalent Sn(5) atoms. In the third O site, O(1) is bonded in a water-like geometry to two equivalent Sn(1) atoms. In the fourth O site, O(2) is bonded in a distorted T-shaped geometry to three equivalent Sn(1) atoms. In the fifth O site, O(3) is bonded in a water-like geometry to two equivalent Sn(2) atoms. In the sixth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Sn(4) and two equivalent Sn(1) atoms. In the seventh O site, O(5) is bonded in a distorted T-shaped geometry to three equivalent Sn(2) atoms. In the eighth O site, O(6) is bonded in a distorted trigonal pyramidal geometry to one Sn(6) and three equivalent Sn(1) atoms. In the ninth O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Sn(3) and two equivalent Sn(5) atoms. In the tenth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Sn(3) and two equivalent Sn(2) atoms. In the eleventh O site, O(9) is bonded in a distorted T-shaped geometry to three equivalent Sn(5) atoms. In the twelfth O site, O(10) is bonded in a distorted trigonal pyramidal geometry to one Sn(4) and three equivalent Sn(2) atoms.
SnO2 crystallizes in the trigonal P3m1 space group. There are six inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to one O(2), one O(6), two equivalent O(1), and two equivalent O(4) atoms to form SnO6 octahedra that share  a cornercorner with one Sn(6)O4 tetrahedra, corners with two equivalent Sn(4)O4 trigonal pyramids, and edges with four equivalent Sn(1)O6 octahedra. The Sn(1)-O(2) bond length is 2.11 Å. The Sn(1)-O(6) bond length is 2.30 Å. Both Sn(1)-O(1) bond lengths are 2.05 Å. Both Sn(1)-O(4) bond lengths are 2.13 Å. In the second Sn site, Sn(2) is bonded to one O(10), one O(5), two equivalent O(3), and two equivalent O(8) atoms to form SnO6 octahedra that share  a cornercorner with one Sn(4)O4 trigonal pyramid,  an edgeedge with one Sn(3)O6 octahedra, and edges with four equivalent Sn(2)O6 octahedra. The Sn(2)-O(10) bond length is 2.33 Å. The Sn(2)-O(5) bond length is 2.15 Å. Both Sn(2)-O(3) bond lengths are 2.03 Å. Both Sn(2)-O(8) bond lengths are 2.17 Å. In the third Sn site, Sn(3) is bonded to three equivalent O(7) and three equivalent O(8) atoms to form edge-sharing SnO6 octahedra. All Sn(3)-O(7) bond lengths are 2.19 Å. All Sn(3)-O(8) bond lengths are 2.07 Å. In the fourth Sn site, Sn(4) is bonded to one O(10) and three equivalent O(4) atoms to form corner-sharing SnO4 trigonal pyramids. The corner-sharing octahedral tilt angles range from 58-68°. The Sn(4)-O(10) bond length is 2.10 Å. All Sn(4)-O(4) bond lengths are 2.05 Å. In the fifth Sn site, Sn(5) is bonded to one O(12), one O(9), two equivalent O(11), and two equivalent O(7) atoms to form SnO6 octahedra that share corners with two equivalent Sn(6)O4 tetrahedra,  an edgeedge with one Sn(3)O6 octahedra, and edges with four equivalent Sn(5)O6 octahedra. The Sn(5)-O(12) bond length is 2.11 Å. The Sn(5)-O(9) bond length is 2.15 Å. Both Sn(5)-O(11) bond lengths are 2.17 Å. Both Sn(5)-O(7) bond lengths are 2.10 Å. In the sixth Sn site, Sn(6) is bonded to one O(6) and three equivalent O(11) atoms to form corner-sharing SnO4 tetrahedra. The corner-sharing octahedral tilt angles range from 57-60°. The Sn(6)-O(6) bond length is 2.03 Å. All Sn(6)-O(11) bond lengths are 2.01 Å. There are twelve inequivalent O sites. In the first O site, O(11) is bonded in a trigonal planar geometry to one Sn(6) and two equivalent Sn(5) atoms. In the second O site, O(12) is bonded in a trigonal non-coplanar geometry to three equivalent Sn(5) atoms. In the third O site, O(1) is bonded in a water-like geometry to two equivalent Sn(1) atoms. In the fourth O site, O(2) is bonded in a distorted T-shaped geometry to three equivalent Sn(1) atoms. In the fifth O site, O(3) is bonded in a water-like geometry to two equivalent Sn(2) atoms. In the sixth O site, O(4) is bonded in a trigonal non-coplanar geometry to one Sn(4) and two equivalent Sn(1) atoms. In the seventh O site, O(5) is bonded in a distorted T-shaped geometry to three equivalent Sn(2) atoms. In the eighth O site, O(6) is bonded in a distorted trigonal pyramidal geometry to one Sn(6) and three equivalent Sn(1) atoms. In the ninth O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Sn(3) and two equivalent Sn(5) atoms. In the tenth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Sn(3) and two equivalent Sn(2) atoms. In the eleventh O site, O(9) is bonded in a distorted T-shaped geometry to three equivalent Sn(5) atoms. In the twelfth O site, O(10) is bonded in a distorted trigonal pyramidal geometry to one Sn(4) and three equivalent Sn(2) atoms.