Mn2AsHO5 crystallizes in the orthorhombic Pnnm space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra, corners with four equivalent Mn(2)O5 trigonal bipyramids, and edges with two equivalent Mn(1)O6 octahedra. In the second Mn site, Mn(2) is bonded to one O(1), two equivalent O(3), and two equivalent O(4) atoms to form MnO5 trigonal bipyramids that share corners with four equivalent Mn(1)O6 octahedra, corners with four equivalent As(1)O4 tetrahedra, and  an edgeedge with one Mn(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 55-69°. As(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form AsO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra and corners with four equivalent Mn(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 54-62°. H(1) is bonded in a single-bond geometry to one O(1) atom. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Mn(2), two equivalent Mn(1), and one H(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Mn(1) and one As(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Mn(2) and one As(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one As(1) atom.
Mn2AsHO5 crystallizes in the orthorhombic Pnnm space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra, corners with four equivalent Mn(2)O5 trigonal bipyramids, and edges with two equivalent Mn(1)O6 octahedra. Both Mn(1)-O(1) bond lengths are 2.15 Å. Both Mn(1)-O(2) bond lengths are 2.15 Å. Both Mn(1)-O(4) bond lengths are 2.27 Å. In the second Mn site, Mn(2) is bonded to one O(1), two equivalent O(3), and two equivalent O(4) atoms to form MnO5 trigonal bipyramids that share corners with four equivalent Mn(1)O6 octahedra, corners with four equivalent As(1)O4 tetrahedra, and  an edgeedge with one Mn(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 55-69°. The Mn(2)-O(1) bond length is 2.10 Å. There is one shorter (2.10 Å) and one longer (2.12 Å) Mn(2)-O(3) bond length. Both Mn(2)-O(4) bond lengths are 2.12 Å. As(1) is bonded to one O(2), one O(3), and two equivalent O(4) atoms to form AsO4 tetrahedra that share corners with four equivalent Mn(1)O6 octahedra and corners with four equivalent Mn(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 54-62°. The As(1)-O(2) bond length is 1.71 Å. The As(1)-O(3) bond length is 1.70 Å. Both As(1)-O(4) bond lengths are 1.71 Å. H(1) is bonded in a single-bond geometry to one O(1) atom. The H(1)-O(1) bond length is 0.97 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Mn(2), two equivalent Mn(1), and one H(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to two equivalent Mn(1) and one As(1) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to two equivalent Mn(2) and one As(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one As(1) atom.