BaAl2Si3(W2O5)2 crystallizes in the orthorhombic P2_12_12 space group. Ba(1) is bonded in a 6-coordinate geometry to four equivalent W(2), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. There are two inequivalent W sites. In the first W site, W(1) is bonded in a distorted single-bond geometry to three equivalent W(2) and one O(1) atom. In the second W site, W(2) is bonded in a 6-coordinate geometry to two equivalent Ba(1), one W(2), and three equivalent W(1) atoms. Al(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra and corners with three equivalent Si(1)O4 tetrahedra. There are two inequivalent Si sites. In the first Si site, 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  a cornercorner with one Si(2)O4 tetrahedra and corners with three equivalent Al(1)O4 tetrahedra. In the second Si site, Si(2) is bonded to two equivalent O(1) 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(1)O4 tetrahedra. There are five inequivalent O sites. In the first O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the second O site, O(5) is bonded in a 2-coordinate geometry to one Ba(1), one Al(1), and one Si(1) atom. In the third O site, O(1) is bonded in a 3-coordinate geometry to one W(1), one Al(1), and one Si(2) 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(1) atom. In the fifth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Ba(1), one Al(1), and one Si(1) atom.
BaAl2Si3(W2O5)2 crystallizes in the orthorhombic P2_12_12 space group. Ba(1) is bonded in a 6-coordinate geometry to four equivalent W(2), two equivalent O(2), two equivalent O(3), and two equivalent O(5) atoms. There are two shorter (3.65 Å) and two longer (3.80 Å) Ba(1)-W(2) bond lengths. Both Ba(1)-O(2) bond lengths are 3.05 Å. Both Ba(1)-O(3) bond lengths are 3.13 Å. Both Ba(1)-O(5) bond lengths are 3.05 Å. There are two inequivalent W sites. In the first W site, W(1) is bonded in a distorted single-bond geometry to three equivalent W(2) and one O(1) atom. There are a spread of W(1)-W(2) bond distances ranging from 3.03-3.08 Å. The W(1)-O(1) bond length is 2.32 Å. In the second W site, W(2) is bonded in a 6-coordinate geometry to two equivalent Ba(1), one W(2), and three equivalent W(1) atoms. The W(2)-W(2) bond length is 3.22 Å. Al(1) is bonded to one O(1), one O(2), one O(3), and one O(5) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra and corners with three equivalent Si(1)O4 tetrahedra. The Al(1)-O(1) bond length is 1.83 Å. The Al(1)-O(2) bond length is 1.77 Å. The Al(1)-O(3) bond length is 1.75 Å. The Al(1)-O(5) bond length is 1.78 Å. There are two inequivalent Si sites. In the first Si site, 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  a cornercorner with one Si(2)O4 tetrahedra and corners with three equivalent Al(1)O4 tetrahedra. The Si(1)-O(2) bond length is 1.64 Å. The Si(1)-O(3) bond length is 1.64 Å. The Si(1)-O(4) bond length is 1.66 Å. The Si(1)-O(5) bond length is 1.64 Å. In the second Si site, Si(2) is bonded to two equivalent O(1) 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(1)O4 tetrahedra. Both Si(2)-O(1) bond lengths are 1.65 Å. Both Si(2)-O(4) bond lengths are 1.64 Å. There are five inequivalent O sites. In the first O site, O(4) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(2) atom. In the second O site, O(5) is bonded in a 2-coordinate geometry to one Ba(1), one Al(1), and one Si(1) atom. In the third O site, O(1) is bonded in a 3-coordinate geometry to one W(1), one Al(1), and one Si(2) 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(1) atom. In the fifth O site, O(3) is bonded in a distorted bent 150 degrees geometry to one Ba(1), one Al(1), and one Si(1) atom.