GaPO4 is quartz (alpha)-derived structured and crystallizes in the monoclinic P2_1/c space group. There are four inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to one O(12), one O(13), one O(16), and one O(9) atom to form GaO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, and corners with two equivalent P(4)O4 tetrahedra. The Ga(1)-O(12) bond length is 1.87 Å. The Ga(1)-O(13) bond length is 1.86 Å. The Ga(1)-O(16) bond length is 1.86 Å. The Ga(1)-O(9) bond length is 1.87 Å. In the second Ga site, Ga(2) is bonded to one O(3), one O(5), one O(7), and one O(8) atom to form GaO4 tetrahedra that share corners with two equivalent P(1)O4 tetrahedra and corners with two equivalent P(4)O4 tetrahedra. The Ga(2)-O(3) bond length is 1.82 Å. The Ga(2)-O(5) bond length is 1.81 Å. The Ga(2)-O(7) bond length is 1.81 Å. The Ga(2)-O(8) bond length is 1.80 Å. In the third Ga site, Ga(3) is bonded to one O(11), one O(15), one O(2), and one O(4) atom to form GaO4 tetrahedra that share corners with two equivalent P(2)O4 tetrahedra and corners with two equivalent P(3)O4 tetrahedra. The Ga(3)-O(11) bond length is 1.83 Å. The Ga(3)-O(15) bond length is 1.84 Å. The Ga(3)-O(2) bond length is 1.83 Å. The Ga(3)-O(4) bond length is 1.84 Å. In the fourth Ga site, Ga(4) is bonded to one O(1), one O(10), one O(14), and one O(6) atom to form GaO4 tetrahedra that share  a cornercorner with one P(1)O4 tetrahedra,  a cornercorner with one P(2)O4 tetrahedra, and corners with two equivalent P(3)O4 tetrahedra. The Ga(4)-O(1) bond length is 1.85 Å. The Ga(4)-O(10) bond length is 1.85 Å. The Ga(4)-O(14) bond length is 1.85 Å. The Ga(4)-O(6) bond length is 1.83 Å. There are four inequivalent P sites. In the first P site, P(1) is bonded to one O(6), one O(7), one O(8), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Ga(1)O4 tetrahedra,  a cornercorner with one Ga(4)O4 tetrahedra, and corners with two equivalent Ga(2)O4 tetrahedra. The P(1)-O(6) bond length is 1.52 Å. The P(1)-O(7) bond length is 1.52 Å. The P(1)-O(8) bond length is 1.52 Å. The P(1)-O(9) bond length is 1.52 Å. In the second P site, P(2) is bonded to one O(11), one O(13), one O(14), and one O(4) atom to form PO4 tetrahedra that share  a cornercorner with one Ga(1)O4 tetrahedra,  a cornercorner with one Ga(4)O4 tetrahedra, and corners with two equivalent Ga(3)O4 tetrahedra. The P(2)-O(11) bond length is 1.53 Å. The P(2)-O(13) bond length is 1.51 Å. The P(2)-O(14) bond length is 1.53 Å. The P(2)-O(4) bond length is 1.53 Å. In the third P site, P(3) is bonded to one O(1), one O(10), one O(15), and one O(2) atom to form PO4 tetrahedra that share corners with two equivalent Ga(3)O4 tetrahedra and corners with two equivalent Ga(4)O4 tetrahedra. The P(3)-O(1) bond length is 1.52 Å. The P(3)-O(10) bond length is 1.53 Å. The P(3)-O(15) bond length is 1.53 Å. The P(3)-O(2) bond length is 1.53 Å. In the fourth P site, P(4) is bonded to one O(12), one O(16), one O(3), and one O(5) atom to form PO4 tetrahedra that share corners with two equivalent Ga(1)O4 tetrahedra and corners with two equivalent Ga(2)O4 tetrahedra. The P(4)-O(12) bond length is 1.52 Å. The P(4)-O(16) bond length is 1.52 Å. The P(4)-O(3) bond length is 1.53 Å. The P(4)-O(5) bond length is 1.53 Å. There are sixteen inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Ga(4) and one P(3) atom. In the second O site, O(2) is bonded in a distorted bent 150 degrees geometry to one Ga(3) and one P(3) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Ga(2) and one P(4) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Ga(3) and one P(2) atom. In the fifth O site, O(5) is bonded in a distorted bent 150 degrees geometry to one Ga(2) and one P(4) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Ga(4) and one P(1) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Ga(2) and one P(1) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Ga(2) and one P(1) atom. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Ga(1) and one P(1) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Ga(4) and one P(3) atom. In the eleventh O site, O(11) is bonded in a distorted bent 150 degrees geometry to one Ga(3) and one P(2) atom. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Ga(1) and one P(4) atom. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Ga(1) and one P(2) atom. In the fourteenth O site, O(14) is bonded in a distorted bent 150 degrees geometry to one Ga(4) and one P(2) atom. In the fifteenth O site, O(15) is bonded in a bent 150 degrees geometry to one Ga(3) and one P(3) atom. In the sixteenth O site, O(16) is bonded in a distorted bent 150 degrees geometry to one Ga(1) and one P(4) atom. Linkers: 16 [O]P([O])([O])=O. Metal clusters: 16 [Ga]. The MOF has largest included sphere 5.83 A, density 2.14 g/cm3, surface area 2262.82 m2/g, accessible volume 0.23 cm3/g