BaBeSiO4 crystallizes in the monoclinic Cm space group. Ba(1) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(3), and four equivalent O(1) atoms. Be(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form BeO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra. Si(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form SiO4 tetrahedra that share corners with four equivalent Be(1)O4 tetrahedra. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Ba(1), one Be(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Ba(1), one Be(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Ba(1), one Be(1), and one Si(1) atom.
BaBeSiO4 crystallizes in the monoclinic Cm space group. Ba(1) is bonded in a 7-coordinate geometry to one O(2), two equivalent O(3), and four equivalent O(1) atoms. The Ba(1)-O(2) bond length is 2.72 Å. Both Ba(1)-O(3) bond lengths are 2.87 Å. There are two shorter (2.83 Å) and two longer (2.97 Å) Ba(1)-O(1) bond lengths. Be(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form BeO4 tetrahedra that share corners with four equivalent Si(1)O4 tetrahedra. The Be(1)-O(2) bond length is 1.63 Å. The Be(1)-O(3) bond length is 1.63 Å. Both Be(1)-O(1) bond lengths are 1.63 Å. Si(1) is bonded to one O(2), one O(3), and two equivalent O(1) atoms to form SiO4 tetrahedra that share corners with four equivalent Be(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. Both Si(1)-O(1) bond lengths are 1.64 Å. There are three inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent Ba(1), one Be(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Ba(1), one Be(1), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted bent 150 degrees geometry to two equivalent Ba(1), one Be(1), and one Si(1) atom.