SrSiO3 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(3), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted SrO8 hexagonal bipyramids that share  a cornercorner with one Sr(1)O8 hexagonal bipyramid,  a cornercorner with one Sr(2)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, edges with three equivalent Sr(1)O8 hexagonal bipyramids, edges with three equivalent Sr(2)O8 hexagonal bipyramids,  an edgeedge with one Si(2)O4 tetrahedra, and edges with three equivalent Si(1)O4 tetrahedra. In the second Sr site, Sr(2) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form SrO8 hexagonal bipyramids that share corners with two equivalent Sr(1)O8 hexagonal bipyramids, corners with two equivalent Si(1)O4 tetrahedra, edges with six equivalent Sr(1)O8 hexagonal bipyramids, edges with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Si(2)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Sr(1)O8 hexagonal bipyramid,  a cornercorner with one Sr(2)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  an edgeedge with one Sr(2)O8 hexagonal bipyramid, and edges with three equivalent Sr(1)O8 hexagonal bipyramids. In the second Si site, Si(2) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with two equivalent Sr(1)O8 hexagonal bipyramids, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Sr(1)O8 hexagonal bipyramids, and edges with two equivalent Sr(2)O8 hexagonal bipyramids. There are five inequivalent O sites. In the first O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Si(1), and one Si(2) atom. In the second O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Si(2) atom. In the third O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Si(1) atoms. In the fourth O site, O(1) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Si(1) atom. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Si(1) atom.
SrSiO3 crystallizes in the monoclinic C2/c space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded to one O(3), one O(5), two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form distorted SrO8 hexagonal bipyramids that share  a cornercorner with one Sr(1)O8 hexagonal bipyramid,  a cornercorner with one Sr(2)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra, edges with three equivalent Sr(1)O8 hexagonal bipyramids, edges with three equivalent Sr(2)O8 hexagonal bipyramids,  an edgeedge with one Si(2)O4 tetrahedra, and edges with three equivalent Si(1)O4 tetrahedra. The Sr(1)-O(3) bond length is 2.68 Å. The Sr(1)-O(5) bond length is 2.69 Å. Both Sr(1)-O(1) bond lengths are 2.74 Å. There is one shorter (2.46 Å) and one longer (2.70 Å) Sr(1)-O(2) bond length. There is one shorter (2.46 Å) and one longer (2.70 Å) Sr(1)-O(4) bond length. In the second Sr site, Sr(2) is bonded to two equivalent O(1), two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form SrO8 hexagonal bipyramids that share corners with two equivalent Sr(1)O8 hexagonal bipyramids, corners with two equivalent Si(1)O4 tetrahedra, edges with six equivalent Sr(1)O8 hexagonal bipyramids, edges with two equivalent Si(1)O4 tetrahedra, and edges with two equivalent Si(2)O4 tetrahedra. Both Sr(2)-O(1) bond lengths are 2.48 Å. Both Sr(2)-O(2) bond lengths are 2.73 Å. Both Sr(2)-O(3) bond lengths are 2.70 Å. Both Sr(2)-O(4) bond lengths are 2.69 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Sr(1)O8 hexagonal bipyramid,  a cornercorner with one Sr(2)O8 hexagonal bipyramid,  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  an edgeedge with one Sr(2)O8 hexagonal bipyramid, and edges with three equivalent Sr(1)O8 hexagonal bipyramids. The Si(1)-O(1) bond length is 1.60 Å. The Si(1)-O(2) bond length is 1.59 Å. The Si(1)-O(3) bond length is 1.67 Å. The Si(1)-O(5) bond length is 1.67 Å. In the second Si site, Si(2) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with two equivalent Sr(1)O8 hexagonal bipyramids, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Sr(1)O8 hexagonal bipyramids, and edges with two equivalent Sr(2)O8 hexagonal bipyramids. Both Si(2)-O(3) bond lengths are 1.67 Å. Both Si(2)-O(4) bond lengths are 1.59 Å. There are five inequivalent O sites. In the first O site, O(3) is bonded in a 4-coordinate geometry to one Sr(1), one Sr(2), one Si(1), and one Si(2) atom. In the second O site, O(4) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Si(2) atom. In the third O site, O(5) is bonded in a 4-coordinate geometry to two equivalent Sr(1) and two equivalent Si(1) atoms. In the fourth O site, O(1) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Si(1) atom. In the fifth O site, O(2) is bonded in a 4-coordinate geometry to one Sr(2), two equivalent Sr(1), and one Si(1) atom.