ZnGeAs2 is Enargite-like structured and crystallizes in the trigonal R3m space group. Zn(1) is bonded to one As(2) and three equivalent As(1) atoms to form ZnAs4 tetrahedra that share corners with six equivalent Zn(1)As4 tetrahedra and corners with six equivalent Ge(1)As4 tetrahedra. Ge(1) is bonded to one As(1) and three equivalent As(2) atoms to form GeAs4 tetrahedra that share corners with six equivalent Zn(1)As4 tetrahedra and corners with six equivalent Ge(1)As4 tetrahedra. There are two inequivalent As sites. In the first As site, As(1) is bonded to three equivalent Zn(1) and one Ge(1) atom to form AsZn3Ge tetrahedra that share corners with six equivalent As(1)Zn3Ge tetrahedra and corners with six equivalent As(2)ZnGe3 tetrahedra. In the second As site, As(2) is bonded to one Zn(1) and three equivalent Ge(1) atoms to form AsZnGe3 tetrahedra that share corners with six equivalent As(1)Zn3Ge tetrahedra and corners with six equivalent As(2)ZnGe3 tetrahedra.
ZnGeAs2 is Enargite-like structured and crystallizes in the trigonal R3m space group. Zn(1) is bonded to one As(2) and three equivalent As(1) atoms to form ZnAs4 tetrahedra that share corners with six equivalent Zn(1)As4 tetrahedra and corners with six equivalent Ge(1)As4 tetrahedra. The Zn(1)-As(2) bond length is 2.56 Å. All Zn(1)-As(1) bond lengths are 2.42 Å. Ge(1) is bonded to one As(1) and three equivalent As(2) atoms to form GeAs4 tetrahedra that share corners with six equivalent Zn(1)As4 tetrahedra and corners with six equivalent Ge(1)As4 tetrahedra. The Ge(1)-As(1) bond length is 2.42 Å. All Ge(1)-As(2) bond lengths are 2.57 Å. There are two inequivalent As sites. In the first As site, As(1) is bonded to three equivalent Zn(1) and one Ge(1) atom to form AsZn3Ge tetrahedra that share corners with six equivalent As(1)Zn3Ge tetrahedra and corners with six equivalent As(2)ZnGe3 tetrahedra. In the second As site, As(2) is bonded to one Zn(1) and three equivalent Ge(1) atoms to form AsZnGe3 tetrahedra that share corners with six equivalent As(1)Zn3Ge tetrahedra and corners with six equivalent As(2)ZnGe3 tetrahedra.