BaAl2Si3O14 crystallizes in the orthorhombic P2_12_12 space group. Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. Al(1) is bonded to one O(2), one O(3), one O(6), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with three equivalent Si(2)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. In the second Si site, Si(2) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with three equivalent Al(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a 2-coordinate geometry to one Ba(1), one Al(1), and one Si(2) atom. In the second O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Al(1), and one Si(2) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to one Ba(1) and one O(5) atom. In the fourth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Ba(1), one Al(1), and one Si(2) atom. In the fifth O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(1) atom. In the sixth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the seventh O site, O(5) is bonded in a distorted single-bond geometry to one Ba(1) and one O(1) atom.
BaAl2Si3O14 crystallizes in the orthorhombic P2_12_12 space group. Ba(1) is bonded in a 10-coordinate geometry to two equivalent O(1), two equivalent O(2), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. Both Ba(1)-O(1) bond lengths are 3.05 Å. Both Ba(1)-O(2) bond lengths are 2.69 Å. Both Ba(1)-O(5) bond lengths are 3.20 Å. Both Ba(1)-O(6) bond lengths are 2.85 Å. Both Ba(1)-O(7) bond lengths are 3.04 Å. Al(1) is bonded to one O(2), one O(3), one O(6), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with three equivalent Si(2)O4 tetrahedra. The Al(1)-O(2) bond length is 1.77 Å. The Al(1)-O(3) bond length is 1.74 Å. The Al(1)-O(6) bond length is 1.78 Å. The Al(1)-O(7) bond length is 1.78 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded to two equivalent O(3) and two equivalent O(4) atoms to form SiO4 tetrahedra that share corners with two equivalent Al(1)O4 tetrahedra and corners with two equivalent Si(2)O4 tetrahedra. Both Si(1)-O(3) bond lengths are 1.62 Å. Both Si(1)-O(4) bond lengths are 1.65 Å. In the second Si site, Si(2) is bonded to one O(2), one O(4), one O(6), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with three equivalent Al(1)O4 tetrahedra. The Si(2)-O(2) bond length is 1.63 Å. The Si(2)-O(4) bond length is 1.64 Å. The Si(2)-O(6) bond length is 1.65 Å. The Si(2)-O(7) bond length is 1.64 Å. There are seven inequivalent O sites. In the first O site, O(6) is bonded in a 2-coordinate geometry to one Ba(1), one Al(1), and one Si(2) atom. In the second O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Ba(1), one Al(1), and one Si(2) atom. In the third O site, O(1) is bonded in a distorted single-bond geometry to one Ba(1) and one O(5) atom. The O(1)-O(5) bond length is 1.24 Å. In the fourth O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Ba(1), one Al(1), and one Si(2) atom. In the fifth O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(1) atom. In the sixth O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the seventh O site, O(5) is bonded in a distorted single-bond geometry to one Ba(1) and one O(1) atom.