KZn4Sb3O12 crystallizes in the trigonal R3 space group. K(1) is bonded in a 12-coordinate geometry to three equivalent O(1), three equivalent O(2), three equivalent O(3), and three equivalent O(4) atoms. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(4), and two equivalent O(2) atoms to form ZnO4 tetrahedra that share  a cornercorner with one Zn(2)O6 octahedra, corners with five equivalent Sb(1)O6 octahedra, and corners with two equivalent Zn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-61°. In the second Zn site, Zn(2) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form ZnO6 octahedra that share corners with three equivalent Sb(1)O6 octahedra, corners with three equivalent Zn(1)O4 tetrahedra, and edges with three equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 20°. Sb(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form SbO6 octahedra that share  a cornercorner with one Zn(2)O6 octahedra, corners with five equivalent Zn(1)O4 tetrahedra,  an edgeedge with one Zn(2)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 20°. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted trigonal planar geometry to one K(1), one Zn(1), and two equivalent Sb(1) atoms. In the second O site, O(1) is bonded in a distorted trigonal planar geometry to one K(1), one Zn(1), one Zn(2), and one Sb(1) atom. In the third O site, O(2) is bonded to one K(1), two equivalent Zn(1), and one Sb(1) atom to form distorted corner-sharing OKZn2Sb trigonal pyramids. In the fourth O site, O(3) is bonded in a distorted T-shaped geometry to one K(1), one Zn(2), and two equivalent Sb(1) atoms.
KZn4Sb3O12 crystallizes in the trigonal R3 space group. K(1) is bonded in a 12-coordinate geometry to three equivalent O(1), three equivalent O(2), three equivalent O(3), and three equivalent O(4) atoms. All K(1)-O(1) bond lengths are 3.09 Å. All K(1)-O(2) bond lengths are 2.74 Å. All K(1)-O(3) bond lengths are 3.22 Å. All K(1)-O(4) bond lengths are 3.21 Å. There are two inequivalent Zn sites. In the first Zn site, Zn(1) is bonded to one O(1), one O(4), and two equivalent O(2) atoms to form ZnO4 tetrahedra that share  a cornercorner with one Zn(2)O6 octahedra, corners with five equivalent Sb(1)O6 octahedra, and corners with two equivalent Zn(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-61°. The Zn(1)-O(1) bond length is 1.97 Å. The Zn(1)-O(4) bond length is 1.99 Å. There is one shorter (1.99 Å) and one longer (2.00 Å) Zn(1)-O(2) bond length. In the second Zn site, Zn(2) is bonded to three equivalent O(1) and three equivalent O(3) atoms to form ZnO6 octahedra that share corners with three equivalent Sb(1)O6 octahedra, corners with three equivalent Zn(1)O4 tetrahedra, and edges with three equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 20°. All Zn(2)-O(1) bond lengths are 2.08 Å. All Zn(2)-O(3) bond lengths are 2.21 Å. Sb(1) is bonded to one O(1), one O(2), two equivalent O(3), and two equivalent O(4) atoms to form SbO6 octahedra that share  a cornercorner with one Zn(2)O6 octahedra, corners with five equivalent Zn(1)O4 tetrahedra,  an edgeedge with one Zn(2)O6 octahedra, and edges with two equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles are 20°. The Sb(1)-O(1) bond length is 1.97 Å. The Sb(1)-O(2) bond length is 1.99 Å. There is one shorter (2.02 Å) and one longer (2.04 Å) Sb(1)-O(3) bond length. There is one shorter (2.05 Å) and one longer (2.08 Å) Sb(1)-O(4) bond length. There are four inequivalent O sites. In the first O site, O(4) is bonded in a distorted trigonal planar geometry to one K(1), one Zn(1), and two equivalent Sb(1) atoms. In the second O site, O(1) is bonded in a distorted trigonal planar geometry to one K(1), one Zn(1), one Zn(2), and one Sb(1) atom. In the third O site, O(2) is bonded to one K(1), two equivalent Zn(1), and one Sb(1) atom to form distorted corner-sharing OKZn2Sb trigonal pyramids. In the fourth O site, O(3) is bonded in a distorted T-shaped geometry to one K(1), one Zn(2), and two equivalent Sb(1) atoms.