GaPO4 crystallizes in the monoclinic C2/c space group. Ga(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form GaO4 tetrahedra that share corners with four equivalent P(1)O4 tetrahedra. The Ga(1)-O(1) bond length is 1.87 Å. The Ga(1)-O(2) bond length is 1.86 Å. The Ga(1)-O(3) bond length is 1.87 Å. The Ga(1)-O(4) bond length is 1.87 Å. P(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form PO4 tetrahedra that share corners with four equivalent Ga(1)O4 tetrahedra. The P(1)-O(1) bond length is 1.53 Å. The P(1)-O(2) bond length is 1.52 Å. The P(1)-O(3) bond length is 1.52 Å. The P(1)-O(4) bond length is 1.54 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted bent 120 degrees geometry to one Ga(1) and one P(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Ga(1) and one P(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Ga(1) and one P(1) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Ga(1) and one P(1) atom. Linkers: 8 [O]P([O])([O])=O. Metal clusters: 8 [Ga]. The MOF has largest included sphere 4.37 A, density 2.26 g/cm3, surface area 2279.69 m2/g, accessible volume 0.19 cm3/g