BeAlSiHO5 crystallizes in the monoclinic P2_1/c space group. Be(1) is bonded to one O(1), one O(5), and two equivalent O(3) atoms to form BeO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Be(1)O4 tetrahedra, and corners with three equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-59°. Al(1) is bonded to one O(1), one O(5), two equivalent O(2), and two equivalent O(4) atoms to form AlO6 octahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with five equivalent Si(1)O4 tetrahedra, and edges with two equivalent Al(1)O6 octahedra. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with five equivalent Al(1)O6 octahedra and corners with three equivalent Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-57°. H(1) is bonded in a single-bond geometry to one O(5) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Be(1), one Al(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one Si(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Be(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Be(1), one Al(1), and one H(1) atom.
BeAlSiHO5 crystallizes in the monoclinic P2_1/c space group. Be(1) is bonded to one O(1), one O(5), and two equivalent O(3) atoms to form BeO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra, corners with two equivalent Be(1)O4 tetrahedra, and corners with three equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 48-59°. The Be(1)-O(1) bond length is 1.64 Å. The Be(1)-O(5) bond length is 1.62 Å. Both Be(1)-O(3) bond lengths are 1.68 Å. Al(1) is bonded to one O(1), one O(5), two equivalent O(2), and two equivalent O(4) atoms to form AlO6 octahedra that share corners with two equivalent Be(1)O4 tetrahedra, corners with five equivalent Si(1)O4 tetrahedra, and edges with two equivalent Al(1)O6 octahedra. The Al(1)-O(1) bond length is 1.93 Å. The Al(1)-O(5) bond length is 1.89 Å. There is one shorter (1.89 Å) and one longer (1.95 Å) Al(1)-O(2) bond length. There is one shorter (1.87 Å) and one longer (2.00 Å) Al(1)-O(4) bond length. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share corners with five equivalent Al(1)O6 octahedra and corners with three equivalent Be(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-57°. The Si(1)-O(1) bond length is 1.66 Å. The Si(1)-O(2) bond length is 1.65 Å. The Si(1)-O(3) bond length is 1.66 Å. The Si(1)-O(4) bond length is 1.64 Å. H(1) is bonded in a single-bond geometry to one O(5) atom. The H(1)-O(5) bond length is 0.98 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to one Be(1), one Al(1), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one Si(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Be(1) and one Si(1) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Al(1) and one Si(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Be(1), one Al(1), and one H(1) atom.