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Hg2GeO4 crystallizes in the orthorhombic Fddd space group. The structure is three-dimensional. Hg2+ is bonded in a 6-coordinate geometry to six equivalent O2- atoms. There are a spread of Hg–O bond distances ranging from 2.10–2.81 Å. Ge4+ is bonded in a tetrahedral geometry to four equivalent O2- atoms. All Ge–O bond lengths are 1.78 Å. O2- is bonded in a 2-coordinate geometry to three equivalent Hg2+ and one Ge4+ atom.
HgGeO3 is (Cubic) Perovskite structured and crystallizes in the cubic Pm-3m space group. The structure is three-dimensional. Hg2+ is bonded to twelve equivalent O2- atoms to form HgO12 cuboctahedra that share corners with twelve equivalent HgO12 cuboctahedra, faces with six equivalent HgO12 cuboctahedra, and faces with eight equivalent GeO6 octahedra. All Hg–O bond lengths are 2.70 Å. Ge4+ is bonded to six equivalent O2- atoms to form GeO6 octahedra that share corners with six equivalent GeO6 octahedra and faces with eight equivalent HgO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Ge–O bond lengths are 1.91 Å. O2- is bonded in a distorted linear geometry to four equivalent Hg2+ and two equivalent Ge4+ atoms.