Al3Si(PO6)2 is Low Tridymite-derived structured and crystallizes in the triclinic P-1 space group. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(12), one O(6), and one O(7) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with three equivalent P(1,2)O4 tetrahedra. The Al(1)-O(1) bond length is 1.61 Å. The Al(1)-O(12) bond length is 1.61 Å. The Al(1)-O(6) bond length is 1.61 Å. The Al(1)-O(7) bond length is 1.61 Å. In the second Al site, Al(2) is bonded to one O(10), one O(11), one O(4), and one O(5) atom to form AlO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra and corners with three equivalent P(1,2)O4 tetrahedra. The Al(2)-O(10) bond length is 1.61 Å. The Al(2)-O(11) bond length is 1.61 Å. The Al(2)-O(4) bond length is 1.61 Å. The Al(2)-O(5) bond length is 1.61 Å. In the third Al site, Al(3) is bonded to one O(2), one O(3), one O(8), and one O(9) atom to form AlO4 tetrahedra that share corners with two equivalent Si(1)O4 tetrahedra and corners with two equivalent P(1,2)O4 tetrahedra. The Al(3)-O(2) bond length is 1.61 Å. The Al(3)-O(3) bond length is 1.61 Å. The Al(3)-O(8) bond length is 1.61 Å. The Al(3)-O(9) bond length is 1.61 Å. 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  a cornercorner with one Al(1)O4 tetrahedra,  a cornercorner with one Al(2)O4 tetrahedra, and corners with two equivalent Al(3)O4 tetrahedra. The Si(1)-O(1) bond length is 1.63 Å. The Si(1)-O(2) bond length is 1.63 Å. The Si(1)-O(3) bond length is 1.64 Å. The Si(1)-O(4) bond length is 1.63 Å. P(1,2) is bonded to one O(5), one O(6), one O(7), and one O(8) atom to form PO4 tetrahedra that share  a cornercorner with one Al(2)O4 tetrahedra,  a cornercorner with one Al(3)O4 tetrahedra, and corners with two equivalent Al(1)O4 tetrahedra. The P(1,2)-O(5) bond length is 1.63 Å. The P(1,2)-O(6) bond length is 1.63 Å. The P(1,2)-O(7) bond length is 1.64 Å. The P(1,2)-O(8) bond length is 1.63 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Al(1) and one Si(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Al(3) and one Si(1) atom. In the third O site, O(3) is bonded in a bent 150 degrees geometry to one Al(3) and one Si(1) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Al(2) and one Si(1) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1,2) atom. In the sixth O site, O(6) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1,2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1,2) atom. In the eighth O site, O(8) is bonded in a bent 150 degrees geometry to one Al(3) and one P(1,2) atom. In the ninth O site, O(9) is bonded in a bent 150 degrees geometry to one Al(3) and one P(1,2) atom. The O(9)-P(1,2) bond length is 1.63 Å. In the tenth O site, O(10) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1,2) atom. The O(10)-P(1,2) bond length is 1.63 Å. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1,2) atom. The O(11)-P(1,2) bond length is 1.64 Å. In the twelfth O site, O(12) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1,2) atom. The O(12)-P(1,2) bond length is 1.63 Å. Linkers: 12 [O]P([O])([O])=O ,6 [O][Si]([O])([O])[O]. Metal clusters: 18 [Al]. The MOF has largest included sphere 6.65 A, density 1.50 g/cm3, surface area 2712.79 m2/g, accessible volume 0.35 cm3/g