Al4P3(HO5)3 crystallizes in the monoclinic C2/c space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(3), one O(5), one O(6), and two equivalent O(8) atoms to form AlO6 octahedra that share  a cornercorner with one Al(2)O6 octahedra, corners with two equivalent Al(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  a faceface with one Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-52°. In the second Al site, Al(2) is bonded to one O(1), one O(2), one O(4), one O(5), one O(7), and one O(8) atom to form AlO6 octahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  a faceface with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-51°. There are two inequivalent P sites. In the first P site, P(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra and corners with four equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-47°. In the second P site, P(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Al(2)O6 octahedra and corners with three equivalent Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 22-50°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(7) atom. In the second H site, H(2) is bonded in a single-bond geometry to one O(8) atom. There are eight inequivalent O sites. In the first O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Al(2) and one H(1) atom. In the second O site, O(8) is bonded in a distorted single-bond geometry to one Al(2), two equivalent Al(1), and one H(2) atom. In the third O site, O(1) is bonded in a distorted T-shaped geometry to one Al(1), one Al(2), and one P(1) atom. In the fourth O site, O(2) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the fifth O site, O(6) is bonded in a bent 150 degrees geometry to one Al(1) and one P(2) atom. In the sixth O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one P(2) atom. In the seventh O site, O(4) is bonded in a bent 150 degrees geometry to one Al(2) and one P(2) atom. In the eighth O site, O(5) is bonded in a distorted T-shaped geometry to one Al(1), one Al(2), and one P(2) atom.
Al4P3(HO5)3 crystallizes in the monoclinic C2/c space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded to one O(1), one O(3), one O(5), one O(6), and two equivalent O(8) atoms to form AlO6 octahedra that share  a cornercorner with one Al(2)O6 octahedra, corners with two equivalent Al(1)O6 octahedra,  a cornercorner with one P(1)O4 tetrahedra, corners with three equivalent P(2)O4 tetrahedra, and  a faceface with one Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 51-52°. The Al(1)-O(1) bond length is 1.97 Å. The Al(1)-O(3) bond length is 1.81 Å. The Al(1)-O(5) bond length is 1.96 Å. The Al(1)-O(6) bond length is 1.82 Å. There is one shorter (1.98 Å) and one longer (2.05 Å) Al(1)-O(8) bond length. In the second Al site, Al(2) is bonded to one O(1), one O(2), one O(4), one O(5), one O(7), and one O(8) atom to form AlO6 octahedra that share  a cornercorner with one Al(1)O6 octahedra,  a cornercorner with one Al(2)O6 octahedra, corners with two equivalent P(1)O4 tetrahedra, corners with two equivalent P(2)O4 tetrahedra, and  a faceface with one Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 42-51°. The Al(2)-O(1) bond length is 1.99 Å. The Al(2)-O(2) bond length is 1.82 Å. The Al(2)-O(4) bond length is 1.81 Å. The Al(2)-O(5) bond length is 1.97 Å. The Al(2)-O(7) bond length is 1.84 Å. The Al(2)-O(8) bond length is 2.10 Å. There are two inequivalent P sites. In the first P site, P(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form PO4 tetrahedra that share corners with two equivalent Al(1)O6 octahedra and corners with four equivalent Al(2)O6 octahedra. The corner-sharing octahedral tilt angles range from 32-47°. Both P(1)-O(1) bond lengths are 1.56 Å. Both P(1)-O(2) bond lengths are 1.51 Å. In the second P site, P(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form PO4 tetrahedra that share corners with two equivalent Al(2)O6 octahedra and corners with three equivalent Al(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 22-50°. The P(2)-O(3) bond length is 1.53 Å. The P(2)-O(4) bond length is 1.52 Å. The P(2)-O(5) bond length is 1.58 Å. The P(2)-O(6) bond length is 1.53 Å. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(7) atom. The H(1)-O(7) bond length is 0.98 Å. In the second H site, H(2) is bonded in a single-bond geometry to one O(8) atom. The H(2)-O(8) bond length is 0.99 Å. There are eight inequivalent O sites. In the first O site, O(7) is bonded in a distorted trigonal planar geometry to two equivalent Al(2) and one H(1) atom. In the second O site, O(8) is bonded in a distorted single-bond geometry to one Al(2), two equivalent Al(1), and one H(2) atom. In the third O site, O(1) is bonded in a distorted T-shaped geometry to one Al(1), one Al(2), and one P(1) atom. In the fourth O site, O(2) is bonded in a bent 150 degrees geometry to one Al(2) and one P(1) atom. In the fifth O site, O(6) is bonded in a bent 150 degrees geometry to one Al(1) and one P(2) atom. In the sixth O site, O(3) is bonded in a bent 150 degrees geometry to one Al(1) and one P(2) atom. In the seventh O site, O(4) is bonded in a bent 150 degrees geometry to one Al(2) and one P(2) atom. In the eighth O site, O(5) is bonded in a distorted T-shaped geometry to one Al(1), one Al(2), and one P(2) atom.