Zn2TeSe is Lavarevi\'{c}ite-like structured and crystallizes in the trigonal R3m space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to three equivalent Te(1) and one Se(1) atom to form ZnTe3Se tetrahedra that share corners with six equivalent Zn(1)Te3Se tetrahedra and corners with six equivalent Zn(2)TeSe3 tetrahedra. In the second Zn site, Zn(2) is bonded to one Te(1) and three equivalent Se(1) atoms to form ZnTeSe3 tetrahedra that share corners with six equivalent Zn(1)Te3Se tetrahedra and corners with six equivalent Zn(2)TeSe3 tetrahedra. Te(1) is bonded to one Zn(2) and three equivalent Zn(1) atoms to form TeZn4 tetrahedra that share corners with six equivalent Te(1)Zn4 tetrahedra and corners with six equivalent Se(1)Zn4 tetrahedra. Se(1) is bonded to one Zn(1) and three equivalent Zn(2) atoms to form SeZn4 tetrahedra that share corners with six equivalent Te(1)Zn4 tetrahedra and corners with six equivalent Se(1)Zn4 tetrahedra.
Zn2TeSe is Lavarevi\'{c}ite-like structured and crystallizes in the trigonal R3m space group. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to three equivalent Te(1) and one Se(1) atom to form ZnTe3Se tetrahedra that share corners with six equivalent Zn(1)Te3Se tetrahedra and corners with six equivalent Zn(2)TeSe3 tetrahedra. All Zn(1)-Te(1) bond lengths are 2.62 Å. The Zn(1)-Se(1) bond length is 2.48 Å. In the second Zn site, Zn(2) is bonded to one Te(1) and three equivalent Se(1) atoms to form ZnTeSe3 tetrahedra that share corners with six equivalent Zn(1)Te3Se tetrahedra and corners with six equivalent Zn(2)TeSe3 tetrahedra. The Zn(2)-Te(1) bond length is 2.67 Å. All Zn(2)-Se(1) bond lengths are 2.55 Å. Te(1) is bonded to one Zn(2) and three equivalent Zn(1) atoms to form TeZn4 tetrahedra that share corners with six equivalent Te(1)Zn4 tetrahedra and corners with six equivalent Se(1)Zn4 tetrahedra. Se(1) is bonded to one Zn(1) and three equivalent Zn(2) atoms to form SeZn4 tetrahedra that share corners with six equivalent Te(1)Zn4 tetrahedra and corners with six equivalent Se(1)Zn4 tetrahedra.