Zn2AsO5 crystallizes in the orthorhombic Pnnm space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(4), two equivalent O(1), and two equivalent O(3) atoms to form ZnO5 trigonal bipyramids that share corners with four equivalent Zn(2)O6 octahedra, corners with four equivalent As(1)O4 tetrahedra, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 52-61°. In the second Zn site, Zn(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form ZnO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra, corners with four equivalent Zn(1)O5 trigonal bipyramids, and edges with two equivalent Zn(2)O6 octahedra. As(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form AsO4 tetrahedra that share corners with four equivalent Zn(2)O6 octahedra and corners with four equivalent Zn(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 55-68°. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Zn(1) and one As(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Zn(2) and one As(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one As(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Zn(1) and two equivalent Zn(2) atoms.
Zn2AsO5 crystallizes in the orthorhombic Pnnm space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(4), two equivalent O(1), and two equivalent O(3) atoms to form ZnO5 trigonal bipyramids that share corners with four equivalent Zn(2)O6 octahedra, corners with four equivalent As(1)O4 tetrahedra, and  an edgeedge with one Zn(1)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 52-61°. The Zn(1)-O(4) bond length is 1.97 Å. There is one shorter (2.04 Å) and one longer (2.06 Å) Zn(1)-O(1) bond length. Both Zn(1)-O(3) bond lengths are 2.02 Å. In the second Zn site, Zn(2) is bonded to two equivalent O(2), two equivalent O(3), and two equivalent O(4) atoms to form ZnO6 octahedra that share corners with four equivalent As(1)O4 tetrahedra, corners with four equivalent Zn(1)O5 trigonal bipyramids, and edges with two equivalent Zn(2)O6 octahedra. Both Zn(2)-O(2) bond lengths are 2.04 Å. Both Zn(2)-O(3) bond lengths are 2.37 Å. Both Zn(2)-O(4) bond lengths are 1.97 Å. As(1) is bonded to one O(1), one O(2), and two equivalent O(3) atoms to form AsO4 tetrahedra that share corners with four equivalent Zn(2)O6 octahedra and corners with four equivalent Zn(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 55-68°. The As(1)-O(1) bond length is 1.73 Å. The As(1)-O(2) bond length is 1.75 Å. Both As(1)-O(3) bond lengths are 1.72 Å. There are four inequivalent O sites. In the first O site, O(1) is bonded in a trigonal planar geometry to two equivalent Zn(1) and one As(1) atom. In the second O site, O(2) is bonded in a trigonal planar geometry to two equivalent Zn(2) and one As(1) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Zn(1), one Zn(2), and one As(1) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Zn(1) and two equivalent Zn(2) atoms.