CaSn2O5 crystallizes in the orthorhombic Pmmn space group. Ca(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. Sn(1) is bonded to one O(1), one O(3), and three equivalent O(2) atoms to form a mixture of distorted corner and edge-sharing SnO5 trigonal bipyramids. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ca(1) and two equivalent Sn(1) atoms to form corner-sharing OCa2Sn2 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ca(1) and three equivalent Sn(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ca(1) and one Sn(1) atom.
CaSn2O5 crystallizes in the orthorhombic Pmmn space group. Ca(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(2), and four equivalent O(3) atoms. Both Ca(1)-O(1) bond lengths are 2.51 Å. Both Ca(1)-O(2) bond lengths are 2.88 Å. All Ca(1)-O(3) bond lengths are 2.45 Å. Sn(1) is bonded to one O(1), one O(3), and three equivalent O(2) atoms to form a mixture of distorted corner and edge-sharing SnO5 trigonal bipyramids. The Sn(1)-O(1) bond length is 2.08 Å. The Sn(1)-O(3) bond length is 1.94 Å. There are two shorter (2.08 Å) and one longer (2.14 Å) Sn(1)-O(2) bond length. There are three inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ca(1) and two equivalent Sn(1) atoms to form corner-sharing OCa2Sn2 tetrahedra. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ca(1) and three equivalent Sn(1) atoms. In the third O site, O(3) is bonded in a distorted trigonal non-coplanar geometry to two equivalent Ca(1) and one Sn(1) atom.