Cu2HgGeSe4 is Stannite structured and crystallizes in the tetragonal I-42m space group. Cu(1) is bonded to four equivalent Se(1) atoms to form CuSe4 tetrahedra that share corners with four equivalent Cu(1)Se4 tetrahedra, corners with four equivalent Hg(1)Se4 tetrahedra, and corners with four equivalent Ge(1)Se4 tetrahedra. Hg(1) is bonded to four equivalent Se(1) atoms to form HgSe4 tetrahedra that share corners with four equivalent Ge(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. Ge(1) is bonded to four equivalent Se(1) atoms to form GeSe4 tetrahedra that share corners with four equivalent Hg(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. Se(1) is bonded to two equivalent Cu(1), one Hg(1), and one Ge(1) atom to form corner-sharing SeCu2HgGe tetrahedra.
Cu2HgGeSe4 is Stannite structured and crystallizes in the tetragonal I-42m space group. Cu(1) is bonded to four equivalent Se(1) atoms to form CuSe4 tetrahedra that share corners with four equivalent Cu(1)Se4 tetrahedra, corners with four equivalent Hg(1)Se4 tetrahedra, and corners with four equivalent Ge(1)Se4 tetrahedra. All Cu(1)-Se(1) bond lengths are 2.43 Å. Hg(1) is bonded to four equivalent Se(1) atoms to form HgSe4 tetrahedra that share corners with four equivalent Ge(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. All Hg(1)-Se(1) bond lengths are 2.72 Å. Ge(1) is bonded to four equivalent Se(1) atoms to form GeSe4 tetrahedra that share corners with four equivalent Hg(1)Se4 tetrahedra and corners with eight equivalent Cu(1)Se4 tetrahedra. All Ge(1)-Se(1) bond lengths are 2.45 Å. Se(1) is bonded to two equivalent Cu(1), one Hg(1), and one Ge(1) atom to form corner-sharing SeCu2HgGe tetrahedra.