HgZnSe2 is Enargite-like structured and crystallizes in the trigonal R3m space group. Hg(1) is bonded to one Se(1) and three equivalent Se(2) atoms to form HgSe4 tetrahedra that share corners with six equivalent Hg(1)Se4 tetrahedra and corners with six equivalent Zn(1)Se4 tetrahedra. Zn(1) is bonded to one Se(2) and three equivalent Se(1) atoms to form ZnSe4 tetrahedra that share corners with six equivalent Hg(1)Se4 tetrahedra and corners with six equivalent Zn(1)Se4 tetrahedra. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to one Hg(1) and three equivalent Zn(1) atoms to form SeZn3Hg tetrahedra that share corners with six equivalent Se(1)Zn3Hg tetrahedra and corners with six equivalent Se(2)ZnHg3 tetrahedra. In the second Se site, Se(2) is bonded to three equivalent Hg(1) and one Zn(1) atom to form SeZnHg3 tetrahedra that share corners with six equivalent Se(1)Zn3Hg tetrahedra and corners with six equivalent Se(2)ZnHg3 tetrahedra.
HgZnSe2 is Enargite-like structured and crystallizes in the trigonal R3m space group. Hg(1) is bonded to one Se(1) and three equivalent Se(2) atoms to form HgSe4 tetrahedra that share corners with six equivalent Hg(1)Se4 tetrahedra and corners with six equivalent Zn(1)Se4 tetrahedra. The Hg(1)-Se(1) bond length is 2.70 Å. All Hg(1)-Se(2) bond lengths are 2.67 Å. Zn(1) is bonded to one Se(2) and three equivalent Se(1) atoms to form ZnSe4 tetrahedra that share corners with six equivalent Hg(1)Se4 tetrahedra and corners with six equivalent Zn(1)Se4 tetrahedra. The Zn(1)-Se(2) bond length is 2.48 Å. All Zn(1)-Se(1) bond lengths are 2.56 Å. There are two inequivalent Se sites. In the first Se site, Se(1) is bonded to one Hg(1) and three equivalent Zn(1) atoms to form SeZn3Hg tetrahedra that share corners with six equivalent Se(1)Zn3Hg tetrahedra and corners with six equivalent Se(2)ZnHg3 tetrahedra. In the second Se site, Se(2) is bonded to three equivalent Hg(1) and one Zn(1) atom to form SeZnHg3 tetrahedra that share corners with six equivalent Se(1)Zn3Hg tetrahedra and corners with six equivalent Se(2)ZnHg3 tetrahedra.