Cr12Zn3(GaSe12)2 is beta indium sulfide-derived structured and crystallizes in the tetragonal I-4m2 space group. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one Se(3), two equivalent Se(1), and three equivalent Se(4) atoms to form CrSe6 octahedra that share  a cornercorner with one Zn(1)Se4 tetrahedra, corners with three equivalent Ga(1)Se4 tetrahedra, edges with two equivalent Cr(2)Se6 octahedra, and edges with four equivalent Cr(1)Se6 octahedra. In the second Cr site, Cr(2) is bonded to one Se(1), one Se(5), two equivalent Se(3), and two equivalent Se(6) atoms to form CrSe6 octahedra that share  a cornercorner with one Zn(2)Se4 tetrahedra, corners with two equivalent Zn(1)Se4 tetrahedra, corners with two equivalent Ga(1)Se4 tetrahedra, edges with two equivalent Cr(1)Se6 octahedra, edges with two equivalent Cr(2)Se6 octahedra, and edges with two equivalent Cr(3)Se6 octahedra. In the third Cr site, Cr(3) is bonded to one Se(6), two equivalent Se(5), and three equivalent Se(2) atoms to form CrSe6 octahedra that share  a cornercorner with one Ga(1)Se4 tetrahedra, corners with two equivalent Zn(2)Se4 tetrahedra, corners with three equivalent Zn(1)Se4 tetrahedra, edges with two equivalent Cr(2)Se6 octahedra, and edges with four equivalent Cr(3)Se6 octahedra. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent Se(2) and two equivalent Se(3) atoms to form ZnSe4 tetrahedra that share corners with two equivalent Cr(1)Se6 octahedra, corners with four equivalent Cr(2)Se6 octahedra, and corners with six equivalent Cr(3)Se6 octahedra. The corner-sharing octahedral tilt angles range from 56-58°. In the second Zn site, Zn(2) is bonded to four equivalent Se(5) atoms to form ZnSe4 tetrahedra that share corners with four equivalent Cr(2)Se6 octahedra and corners with eight equivalent Cr(3)Se6 octahedra. The corner-sharing octahedral tilt angles range from 58-59°. Ga(1) is bonded to two equivalent Se(4) and two equivalent Se(6) atoms to form GaSe4 tetrahedra that share corners with two equivalent Cr(3)Se6 octahedra, corners with four equivalent Cr(2)Se6 octahedra, and corners with six equivalent Cr(1)Se6 octahedra. The corner-sharing octahedral tilt angles range from 58-61°. There are six inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted T-shaped geometry to one Cr(2) and two equivalent Cr(1) atoms. In the second Se site, Se(2) is bonded to three equivalent Cr(3) and one Zn(1) atom to form distorted SeZnCr3 trigonal pyramids that share  a cornercorner with one Se(2)ZnCr3 trigonal pyramid, corners with three equivalent Se(6)Cr3Ga trigonal pyramids, corners with six equivalent Se(5)ZnCr3 trigonal pyramids, and edges with three equivalent Se(2)ZnCr3 trigonal pyramids. In the third Se site, Se(3) is bonded in a rectangular see-saw-like geometry to one Cr(1), two equivalent Cr(2), and one Zn(1) atom. In the fourth Se site, Se(4) is bonded to three equivalent Cr(1) and one Ga(1) atom to form a mixture of distorted corner and edge-sharing SeCr3Ga tetrahedra. In the fifth Se site, Se(5) is bonded to one Cr(2), two equivalent Cr(3), and one Zn(2) atom to form distorted SeZnCr3 trigonal pyramids that share corners with three equivalent Se(5)ZnCr3 trigonal pyramids, corners with six equivalent Se(2)ZnCr3 trigonal pyramids,  an edgeedge with one Se(5)ZnCr3 trigonal pyramid, and edges with two equivalent Se(6)Cr3Ga trigonal pyramids. In the sixth Se site, Se(6) is bonded to one Cr(3), two equivalent Cr(2), and one Ga(1) atom to form distorted SeCr3Ga trigonal pyramids that share corners with two equivalent Se(4)Cr3Ga tetrahedra,  a cornercorner with one Se(6)Cr3Ga trigonal pyramid, corners with three equivalent Se(2)ZnCr3 trigonal pyramids,  an edgeedge with one Se(6)Cr3Ga trigonal pyramid, and edges with two equivalent Se(5)ZnCr3 trigonal pyramids.
Cr12Zn3(GaSe12)2 is beta indium sulfide-derived structured and crystallizes in the tetragonal I-4m2 space group. There are three inequivalent Cr sites. In the first Cr site, Cr(1) is bonded to one Se(3), two equivalent Se(1), and three equivalent Se(4) atoms to form CrSe6 octahedra that share  a cornercorner with one Zn(1)Se4 tetrahedra, corners with three equivalent Ga(1)Se4 tetrahedra, edges with two equivalent Cr(2)Se6 octahedra, and edges with four equivalent Cr(1)Se6 octahedra. The Cr(1)-Se(3) bond length is 2.51 Å. Both Cr(1)-Se(1) bond lengths are 2.49 Å. There is one shorter (2.58 Å) and two longer (2.62 Å) Cr(1)-Se(4) bond lengths. In the second Cr site, Cr(2) is bonded to one Se(1), one Se(5), two equivalent Se(3), and two equivalent Se(6) atoms to form CrSe6 octahedra that share  a cornercorner with one Zn(2)Se4 tetrahedra, corners with two equivalent Zn(1)Se4 tetrahedra, corners with two equivalent Ga(1)Se4 tetrahedra, edges with two equivalent Cr(1)Se6 octahedra, edges with two equivalent Cr(2)Se6 octahedra, and edges with two equivalent Cr(3)Se6 octahedra. The Cr(2)-Se(1) bond length is 2.50 Å. The Cr(2)-Se(5) bond length is 2.58 Å. Both Cr(2)-Se(3) bond lengths are 2.52 Å. Both Cr(2)-Se(6) bond lengths are 2.57 Å. In the third Cr site, Cr(3) is bonded to one Se(6), two equivalent Se(5), and three equivalent Se(2) atoms to form CrSe6 octahedra that share  a cornercorner with one Ga(1)Se4 tetrahedra, corners with two equivalent Zn(2)Se4 tetrahedra, corners with three equivalent Zn(1)Se4 tetrahedra, edges with two equivalent Cr(2)Se6 octahedra, and edges with four equivalent Cr(3)Se6 octahedra. The Cr(3)-Se(6) bond length is 2.56 Å. Both Cr(3)-Se(5) bond lengths are 2.54 Å. There is one shorter (2.54 Å) and two longer (2.55 Å) Cr(3)-Se(2) bond lengths. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to two equivalent Se(2) and two equivalent Se(3) atoms to form ZnSe4 tetrahedra that share corners with two equivalent Cr(1)Se6 octahedra, corners with four equivalent Cr(2)Se6 octahedra, and corners with six equivalent Cr(3)Se6 octahedra. The corner-sharing octahedral tilt angles range from 56-58°. Both Zn(1)-Se(2) bond lengths are 2.48 Å. Both Zn(1)-Se(3) bond lengths are 2.48 Å. In the second Zn site, Zn(2) is bonded to four equivalent Se(5) atoms to form ZnSe4 tetrahedra that share corners with four equivalent Cr(2)Se6 octahedra and corners with eight equivalent Cr(3)Se6 octahedra. The corner-sharing octahedral tilt angles range from 58-59°. All Zn(2)-Se(5) bond lengths are 2.49 Å. Ga(1) is bonded to two equivalent Se(4) and two equivalent Se(6) atoms to form GaSe4 tetrahedra that share corners with two equivalent Cr(3)Se6 octahedra, corners with four equivalent Cr(2)Se6 octahedra, and corners with six equivalent Cr(1)Se6 octahedra. The corner-sharing octahedral tilt angles range from 58-61°. Both Ga(1)-Se(4) bond lengths are 2.47 Å. Both Ga(1)-Se(6) bond lengths are 2.50 Å. There are six inequivalent Se sites. In the first Se site, Se(1) is bonded in a distorted T-shaped geometry to one Cr(2) and two equivalent Cr(1) atoms. In the second Se site, Se(2) is bonded to three equivalent Cr(3) and one Zn(1) atom to form distorted SeZnCr3 trigonal pyramids that share  a cornercorner with one Se(2)ZnCr3 trigonal pyramid, corners with three equivalent Se(6)Cr3Ga trigonal pyramids, corners with six equivalent Se(5)ZnCr3 trigonal pyramids, and edges with three equivalent Se(2)ZnCr3 trigonal pyramids. In the third Se site, Se(3) is bonded in a rectangular see-saw-like geometry to one Cr(1), two equivalent Cr(2), and one Zn(1) atom. In the fourth Se site, Se(4) is bonded to three equivalent Cr(1) and one Ga(1) atom to form a mixture of distorted corner and edge-sharing SeCr3Ga tetrahedra. In the fifth Se site, Se(5) is bonded to one Cr(2), two equivalent Cr(3), and one Zn(2) atom to form distorted SeZnCr3 trigonal pyramids that share corners with three equivalent Se(5)ZnCr3 trigonal pyramids, corners with six equivalent Se(2)ZnCr3 trigonal pyramids,  an edgeedge with one Se(5)ZnCr3 trigonal pyramid, and edges with two equivalent Se(6)Cr3Ga trigonal pyramids. In the sixth Se site, Se(6) is bonded to one Cr(3), two equivalent Cr(2), and one Ga(1) atom to form distorted SeCr3Ga trigonal pyramids that share corners with two equivalent Se(4)Cr3Ga tetrahedra,  a cornercorner with one Se(6)Cr3Ga trigonal pyramid, corners with three equivalent Se(2)ZnCr3 trigonal pyramids,  an edgeedge with one Se(6)Cr3Ga trigonal pyramid, and edges with two equivalent Se(5)ZnCr3 trigonal pyramids.