GaOOH crystallizes in the orthorhombic Fdd2 space group. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing GaO6 pentagonal pyramids. In the second Ga site, Ga(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing GaO6 pentagonal pyramids. H(1) is bonded in a single-bond geometry to one O(2) atom. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ga(1) and two equivalent Ga(2) atoms to form a mixture of corner and edge-sharing OGa4 tetrahedra. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ga(1), one Ga(2), and one H(1) atom.
GaOOH crystallizes in the orthorhombic Fdd2 space group. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing GaO6 pentagonal pyramids. Both Ga(1)-O(2) bond lengths are 2.06 Å. There are two shorter (2.01 Å) and two longer (2.12 Å) Ga(1)-O(1) bond lengths. In the second Ga site, Ga(2) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form a mixture of distorted corner and edge-sharing GaO6 pentagonal pyramids. Both Ga(2)-O(2) bond lengths are 2.02 Å. There are two shorter (2.01 Å) and two longer (2.15 Å) Ga(2)-O(1) bond lengths. H(1) is bonded in a single-bond geometry to one O(2) atom. The H(1)-O(2) bond length is 0.98 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Ga(1) and two equivalent Ga(2) atoms to form a mixture of corner and edge-sharing OGa4 tetrahedra. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Ga(1), one Ga(2), and one H(1) atom.