AlOOH crystallizes in the triclinic P1 space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(2), and two equivalent O(3) atoms. In the second Al site, Al(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form a mixture of distorted corner and edge-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 17°. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. In the second H site, H(2) is bonded in a linear geometry to one O(3) and one O(4) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Al(1), two equivalent Al(2), and one H(1) atom. In the second O site, O(2) is bonded to two equivalent Al(1) and two equivalent Al(2) atoms to form corner-sharing OAl4 tetrahedra. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Al(1) and one H(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Al(2) and one H(2) atom.
AlOOH crystallizes in the triclinic P1 space group. There are two inequivalent Al sites. In the first Al site, Al(1) is bonded in a 5-coordinate geometry to one O(1), two equivalent O(2), and two equivalent O(3) atoms. The Al(1)-O(1) bond length is 2.25 Å. There is one shorter (2.00 Å) and one longer (2.03 Å) Al(1)-O(2) bond length. There is one shorter (1.73 Å) and one longer (1.74 Å) Al(1)-O(3) bond length. In the second Al site, Al(2) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form a mixture of distorted corner and edge-sharing AlO6 octahedra. The corner-sharing octahedral tilt angles are 17°. There is one shorter (1.88 Å) and one longer (1.90 Å) Al(2)-O(1) bond length. There is one shorter (1.93 Å) and one longer (2.01 Å) Al(2)-O(2) bond length. There is one shorter (1.87 Å) and one longer (1.93 Å) Al(2)-O(4) bond length. There are two inequivalent H sites. In the first H site, H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 1.00 Å. In the second H site, H(2) is bonded in a linear geometry to one O(3) and one O(4) atom. The H(2)-O(3) bond length is 1.51 Å. The H(2)-O(4) bond length is 1.04 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Al(1), two equivalent Al(2), and one H(1) atom. In the second O site, O(2) is bonded to two equivalent Al(1) and two equivalent Al(2) atoms to form corner-sharing OAl4 tetrahedra. In the third O site, O(3) is bonded in a trigonal planar geometry to two equivalent Al(1) and one H(2) atom. In the fourth O site, O(4) is bonded in a distorted trigonal planar geometry to two equivalent Al(2) and one H(2) atom.