Be3(HPO3)4 crystallizes in the monoclinic C2/c space group. There are two inequivalent Be sites. In the first Be site, Be(1) is bonded to one O(1), one O(2), one O(4), and one O(6) atom to form BeO4 tetrahedra that share corners with two equivalent P(1)HO3 tetrahedra and corners with two equivalent P(2)HO3 tetrahedra. The Be(1)-O(1) bond length is 1.65 Å. The Be(1)-O(2) bond length is 1.62 Å. The Be(1)-O(4) bond length is 1.63 Å. The Be(1)-O(6) bond length is 1.59 Å. In the second Be site, Be(2) is bonded to two equivalent O(3) and two equivalent O(5) atoms to form BeO4 tetrahedra that share corners with two equivalent P(1)HO3 tetrahedra and corners with two equivalent P(2)HO3 tetrahedra. Both Be(2)-O(3) bond lengths are 1.61 Å. Both Be(2)-O(5) bond lengths are 1.63 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to one H(1), one O(1), one O(2), and one O(3) atom to form distorted PHO3 tetrahedra that share  a cornercorner with one Be(2)O4 tetrahedra and corners with two equivalent Be(1)O4 tetrahedra. The P(1)-H(1) bond length is 1.34 Å. The P(1)-O(1) bond length is 1.52 Å. The P(1)-O(2) bond length is 1.50 Å. The P(1)-O(3) bond length is 1.51 Å. In the second P site, P(2) is bonded to one H(2), one O(4), one O(5), and one O(6) atom to form distorted PHO3 tetrahedra that share  a cornercorner with one Be(2)O4 tetrahedra and corners with two equivalent Be(1)O4 tetrahedra. The P(2)-H(2) bond length is 1.40 Å. The P(2)-O(4) bond length is 1.50 Å. The P(2)-O(5) bond length is 1.50 Å. The P(2)-O(6) bond length is 1.50 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one P(1) atom. In the second H site, H(2) is bonded in a single-bond geometry to one P(2) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to one Be(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Be(1) and one P(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Be(2) and one P(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Be(1) and one P(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Be(2) and one P(2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Be(1) and one P(2) atom. Linkers: 16 [O][PH]([O])=O. Metal clusters: 12 [Be]. The MOF has largest included sphere 4.41 A, density 1.33 g/cm3, surface area 3546.38 m2/g, accessible volume 0.32 cm3/g