BaSc2Si3O10 crystallizes in the monoclinic P2_1/m space group. Ba(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. Sc(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(6) atoms to form distorted ScO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Si(2)O4 tetrahedra, and edges with two equivalent Sc(1)O6 octahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with four equivalent Sc(1)O6 octahedra and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-56°. In the second Si site, Si(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share corners with four equivalent Sc(1)O6 octahedra and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 42-61°. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1), two equivalent Sc(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ba(1), two equivalent Sc(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Ba(1), one Si(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ba(1), one Sc(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ba(1), one Sc(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Sc(1) and one Si(2) atom.
BaSc2Si3O10 crystallizes in the monoclinic P2_1/m space group. Ba(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(5) atoms. The Ba(1)-O(1) bond length is 2.98 Å. The Ba(1)-O(2) bond length is 2.81 Å. Both Ba(1)-O(3) bond lengths are 2.91 Å. Both Ba(1)-O(4) bond lengths are 2.76 Å. Both Ba(1)-O(5) bond lengths are 2.71 Å. Sc(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(6) atoms to form distorted ScO6 octahedra that share corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Si(2)O4 tetrahedra, and edges with two equivalent Sc(1)O6 octahedra. The Sc(1)-O(1) bond length is 2.17 Å. The Sc(1)-O(2) bond length is 2.26 Å. The Sc(1)-O(4) bond length is 2.05 Å. The Sc(1)-O(5) bond length is 2.05 Å. There is one shorter (2.16 Å) and one longer (2.17 Å) Sc(1)-O(6) bond length. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form SiO4 tetrahedra that share corners with four equivalent Sc(1)O6 octahedra and corners with two equivalent Si(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 55-56°. The Si(1)-O(1) bond length is 1.62 Å. The Si(1)-O(2) bond length is 1.62 Å. Both Si(1)-O(3) bond lengths are 1.63 Å. In the second Si site, Si(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share corners with four equivalent Sc(1)O6 octahedra and  a cornercorner with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 42-61°. The Si(2)-O(3) bond length is 1.66 Å. The Si(2)-O(4) bond length is 1.60 Å. The Si(2)-O(5) bond length is 1.62 Å. The Si(2)-O(6) bond length is 1.64 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1), two equivalent Sc(1), and one Si(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Ba(1), two equivalent Sc(1), and one Si(1) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Ba(1), one Si(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a 3-coordinate geometry to one Ba(1), one Sc(1), and one Si(2) atom. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Ba(1), one Sc(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a distorted trigonal planar geometry to two equivalent Sc(1) and one Si(2) atom.