CaSnSiO5 crystallizes in the triclinic P-1 space group. Ca(1) is bonded in a 10-coordinate geometry to one Si(1), one O(1), two equivalent O(2), two equivalent 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 in a distorted linear geometry to two equivalent O(1) and two equivalent O(4) atoms. In the second Sn site, Sn(2) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(5) atoms. Si(1) is bonded in a 4-coordinate geometry to one Ca(1), one O(2), one O(3), one O(4), and one O(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Sn(1), and one Sn(2) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to two equivalent Ca(1) and one Si(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Ca(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 3-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 10-coordinate geometry to one Si(1), one O(1), two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. The Ca(1)-Si(1) bond length is 2.80 Å. The Ca(1)-O(1) bond length is 2.54 Å. There is one shorter (2.37 Å) and one longer (3.03 Å) Ca(1)-O(2) bond length. There is one shorter (2.84 Å) and one longer (2.95 Å) Ca(1)-O(3) bond length. There is one shorter (2.25 Å) and one longer (2.81 Å) Ca(1)-O(4) bond length. There is one shorter (2.44 Å) and one longer (3.11 Å) Ca(1)-O(5) bond length. There are two inequivalent Sn sites. In the first Sn site, Sn(1) is bonded in a distorted linear geometry to two equivalent O(1) and two equivalent O(4) atoms. Both Sn(1)-O(1) bond lengths are 1.69 Å. Both Sn(1)-O(4) bond lengths are 2.53 Å. In the second Sn site, Sn(2) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(5) atoms. Both Sn(2)-O(1) bond lengths are 1.66 Å. Both Sn(2)-O(5) bond lengths are 2.13 Å. Si(1) is bonded in a 4-coordinate geometry to one Ca(1), one O(2), one O(3), one O(4), and one O(5) atom. The Si(1)-O(2) bond length is 1.98 Å. The Si(1)-O(3) bond length is 1.52 Å. The Si(1)-O(4) bond length is 1.55 Å. The Si(1)-O(5) bond length is 1.86 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Ca(1), one Sn(1), and one Sn(2) atom. In the second O site, O(2) is bonded in a distorted water-like geometry to two equivalent Ca(1) and one Si(1) atom. In the third O site, O(3) is bonded in a distorted single-bond geometry to two equivalent Ca(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 3-coordinate geometry to two equivalent Ca(1), one Sn(2), and one Si(1) atom.