AlPO4 is low (alpha) Cristobalite-derived structured and crystallizes in the monoclinic C2 space group. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AlO4 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. In the second Al site, Al(2) is bonded to one O(11), one O(12), one O(5), and one O(6) atom to form AlO4 tetrahedra that share  a cornercorner with one P(3)O4 tetrahedra and corners with three equivalent P(1)O4 tetrahedra. In the third Al site, Al(3) is bonded to one O(10), one O(7), one O(8), and one O(9) atom to form AlO4 tetrahedra that share  a cornercorner with one P(3)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(11), one O(12), one O(4), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra and corners with three equivalent Al(2)O4 tetrahedra. In the second P site, P(2) is bonded to one O(10), one O(2), one O(8), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra and corners with three equivalent Al(3)O4 tetrahedra. In the third P site, P(3) is bonded to one O(1), one O(3), one O(5), and one O(7) 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. There are twelve inequivalent O sites. In the first O site, O(8) is bonded in a bent 150 degrees geometry to one Al(3) and one P(2) atom. In the second O site, O(9) is bonded in a bent 150 degrees geometry to one Al(3) and one P(2) atom. In the third O site, O(10) is bonded in a bent 150 degrees geometry to one Al(3) and one P(2) atom. In the fourth O site, O(11) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the fifth O site, O(12) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the sixth O site, O(1) is bonded in a bent 150 degrees geometry to one Al(1) and one P(3) atom. In the seventh O site, O(2) is bonded in a bent 150 degrees geometry to one Al(1) and one P(2) atom. In the eighth O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one P(3) atom. In the ninth O site, O(4) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the tenth O site, O(5) is bonded in a bent 150 degrees geometry to one Al(2) and one P(3) atom. In the eleventh O site, O(6) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the twelfth O site, O(7) is bonded in a bent 150 degrees geometry to one Al(3) and one P(3) atom.
AlPO4 is low (alpha) Cristobalite-derived structured and crystallizes in the monoclinic C2 space group. There are three inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form AlO4 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 Al(1)-O(1) bond length is 1.73 Å. The Al(1)-O(2) bond length is 1.74 Å. The Al(1)-O(3) bond length is 1.74 Å. The Al(1)-O(4) bond length is 1.73 Å. In the second Al site, Al(2) is bonded to one O(11), one O(12), one O(5), and one O(6) atom to form AlO4 tetrahedra that share  a cornercorner with one P(3)O4 tetrahedra and corners with three equivalent P(1)O4 tetrahedra. The Al(2)-O(11) bond length is 1.74 Å. The Al(2)-O(12) bond length is 1.73 Å. The Al(2)-O(5) bond length is 1.73 Å. The Al(2)-O(6) bond length is 1.74 Å. In the third Al site, Al(3) is bonded to one O(10), one O(7), one O(8), and one O(9) atom to form AlO4 tetrahedra that share  a cornercorner with one P(3)O4 tetrahedra and corners with three equivalent P(2)O4 tetrahedra. The Al(3)-O(10) bond length is 1.74 Å. The Al(3)-O(7) bond length is 1.73 Å. The Al(3)-O(8) bond length is 1.73 Å. The Al(3)-O(9) bond length is 1.73 Å. There are three inequivalent P sites. In the first P site, P(1) is bonded to one O(11), one O(12), one O(4), and one O(6) atom to form PO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra and corners with three equivalent Al(2)O4 tetrahedra. The P(1)-O(11) bond length is 1.52 Å. The P(1)-O(12) bond length is 1.53 Å. The P(1)-O(4) bond length is 1.52 Å. The P(1)-O(6) bond length is 1.52 Å. In the second P site, P(2) is bonded to one O(10), one O(2), one O(8), and one O(9) atom to form PO4 tetrahedra that share  a cornercorner with one Al(1)O4 tetrahedra and corners with three equivalent Al(3)O4 tetrahedra. The P(2)-O(10) bond length is 1.52 Å. The P(2)-O(2) bond length is 1.52 Å. The P(2)-O(8) bond length is 1.52 Å. The P(2)-O(9) bond length is 1.53 Å. In the third P site, P(3) is bonded to one O(1), one O(3), one O(5), and one O(7) 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(3)-O(1) bond length is 1.52 Å. The P(3)-O(3) bond length is 1.52 Å. The P(3)-O(5) bond length is 1.53 Å. The P(3)-O(7) bond length is 1.52 Å. There are twelve inequivalent O sites. In the first O site, O(8) is bonded in a bent 150 degrees geometry to one Al(3) and one P(2) atom. In the second O site, O(9) is bonded in a bent 150 degrees geometry to one Al(3) and one P(2) atom. In the third O site, O(10) is bonded in a bent 150 degrees geometry to one Al(3) and one P(2) atom. In the fourth O site, O(11) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the fifth O site, O(12) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the sixth O site, O(1) is bonded in a bent 150 degrees geometry to one Al(1) and one P(3) atom. In the seventh O site, O(2) is bonded in a bent 150 degrees geometry to one Al(1) and one P(2) atom. In the eighth O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one P(3) atom. In the ninth O site, O(4) is bonded in a bent 150 degrees geometry to one Al(1) and one P(1) atom. In the tenth O site, O(5) is bonded in a bent 150 degrees geometry to one Al(2) and one P(3) atom. In the eleventh O site, O(6) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the twelfth O site, O(7) is bonded in a bent 150 degrees geometry to one Al(3) and one P(3) atom.