Hg(BiO3)2 is Hydrophilite-derived structured and crystallizes in the tetragonal P4_2/mnm space group. Hg(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form HgO6 octahedra that share corners with eight equivalent Bi(1)O6 octahedra and edges with two equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-55°. Bi(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form BiO6 octahedra that share corners with four equivalent Hg(1)O6 octahedra, corners with four equivalent Bi(1)O6 octahedra,  an edgeedge with one Hg(1)O6 octahedra, and  an edgeedge with one Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-55°. There are two inequivalent O sites. In the first O site, O(2) is bonded in a trigonal planar geometry to one Hg(1) and two equivalent Bi(1) atoms. In the second O site, O(1) is bonded in a distorted trigonal planar geometry to one Hg(1) and two equivalent Bi(1) atoms.
Hg(BiO3)2 is Hydrophilite-derived structured and crystallizes in the tetragonal P4_2/mnm space group. Hg(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form HgO6 octahedra that share corners with eight equivalent Bi(1)O6 octahedra and edges with two equivalent Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 53-55°. Both Hg(1)-O(2) bond lengths are 2.23 Å. All Hg(1)-O(1) bond lengths are 2.32 Å. Bi(1) is bonded to two equivalent O(2) and four equivalent O(1) atoms to form BiO6 octahedra that share corners with four equivalent Hg(1)O6 octahedra, corners with four equivalent Bi(1)O6 octahedra,  an edgeedge with one Hg(1)O6 octahedra, and  an edgeedge with one Bi(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 46-55°. Both Bi(1)-O(2) bond lengths are 2.17 Å. There are two shorter (2.12 Å) and two longer (2.15 Å) Bi(1)-O(1) bond lengths. There are two inequivalent O sites. In the first O site, O(2) is bonded in a trigonal planar geometry to one Hg(1) and two equivalent Bi(1) atoms. In the second O site, O(1) is bonded in a distorted trigonal planar geometry to one Hg(1) and two equivalent Bi(1) atoms.