CaSnSiO5 crystallizes in the triclinic P-1 space group. Ca(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), two equivalent O(4), and two equivalent O(5) atoms. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form SnO6 octahedra that share corners with two equivalent Sn(2)O6 octahedra and corners with four equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. In the second Sn site, Sn(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form SnO6 octahedra that share corners with two equivalent Sn(1)O6 octahedra and corners with four equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with two equivalent Sn(1)O6 octahedra and corners with two equivalent Sn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-54°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Ca(1), one Sn(1), and one Sn(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Sn(2), and one Si(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ca(1), one Sn(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Sn(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Sn(2), and one Si(1) atom.
CaSnSiO5 crystallizes in the triclinic P-1 space group. Ca(1) is bonded in a 7-coordinate geometry to one O(1), one O(2), one O(3), two equivalent O(4), and two equivalent O(5) atoms. The Ca(1)-O(1) bond length is 2.24 Å. The Ca(1)-O(2) bond length is 2.44 Å. The Ca(1)-O(3) bond length is 2.43 Å. There is one shorter (2.47 Å) and one longer (2.81 Å) Ca(1)-O(4) bond length. There is one shorter (2.47 Å) and one longer (2.77 Å) Ca(1)-O(5) bond length. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form SnO6 octahedra that share corners with two equivalent Sn(2)O6 octahedra and corners with four equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. Both Sn(1)-O(1) bond lengths are 1.99 Å. Both Sn(1)-O(3) bond lengths are 2.13 Å. Both Sn(1)-O(4) bond lengths are 2.14 Å. In the second Sn site, Sn(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(5) atoms to form SnO6 octahedra that share corners with two equivalent Sn(1)O6 octahedra and corners with four equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles are 48°. Both Sn(2)-O(1) bond lengths are 1.99 Å. Both Sn(2)-O(2) bond lengths are 2.13 Å. Both Sn(2)-O(5) bond lengths are 2.14 Å. Si(1) is bonded to one O(2), one O(3), one O(4), and one O(5) atom to form SiO4 tetrahedra that share corners with two equivalent Sn(1)O6 octahedra and corners with two equivalent Sn(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 41-54°. The Si(1)-O(2) bond length is 1.66 Å. The Si(1)-O(3) bond length is 1.65 Å. The Si(1)-O(4) bond length is 1.66 Å. The Si(1)-O(5) bond length is 1.66 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Ca(1), one Sn(1), and one Sn(2) atom. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Ca(1), one Sn(2), and one Si(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ca(1), one Sn(1), and one Si(1) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Sn(1), and one Si(1) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Ca(1), one Sn(2), and one Si(1) atom.