K7Th6F31 crystallizes in the trigonal R3 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one F(10), one F(2), one F(8), one F(9), two equivalent F(5), and two equivalent F(6) atoms. In the second K site, K(2) is bonded in a 7-coordinate geometry to one F(5), one F(8), one F(9), two equivalent F(2), and two equivalent F(4) atoms. In the third K site, K(3) is bonded in a 6-coordinate geometry to three equivalent F(8) and three equivalent F(9) atoms. There are two inequivalent Th sites. In the first Th site, Th(1) is bonded in a 8-coordinate geometry to one F(1), one F(3), one F(4), one F(5), one F(6), one F(8), and two equivalent F(7) atoms. In the second Th site, Th(2) is bonded in a 9-coordinate geometry to one F(1), one F(11), one F(2), one F(3), one F(4), one F(6), one F(9), and two equivalent F(10) atoms. There are eleven inequivalent F sites. In the first F site, F(1) is bonded in a bent 150 degrees geometry to one Th(1) and one Th(2) atom. In the second F site, F(2) is bonded to one K(1), two equivalent K(2), and one Th(2) atom to form FK3Th tetrahedra that share  a cornercorner with one F(4)K2Th2 tetrahedra, corners with two equivalent F(2)K3Th tetrahedra, corners with two equivalent F(5)K3Th tetrahedra, corners with three equivalent F(6)K2Th2 tetrahedra, corners with three equivalent F(8)K3Th tetrahedra,  an edgeedge with one F(5)K3Th tetrahedra, edges with two equivalent F(4)K2Th2 tetrahedra, and edges with two equivalent F(9)K3Th tetrahedra. In the third F site, F(3) is bonded in a bent 150 degrees geometry to one Th(1) and one Th(2) atom. In the fourth F site, F(4) is bonded to two equivalent K(2), one Th(1), and one Th(2) atom to form FK2Th2 tetrahedra that share  a cornercorner with one F(2)K3Th tetrahedra,  a cornercorner with one F(8)K3Th tetrahedra, corners with two equivalent F(4)K2Th2 tetrahedra, corners with three equivalent F(5)K3Th tetrahedra, corners with three equivalent F(9)K3Th tetrahedra,  an edgeedge with one F(6)K2Th2 tetrahedra,  an edgeedge with one F(8)K3Th tetrahedra, and edges with two equivalent F(2)K3Th tetrahedra. In the fifth F site, F(5) is bonded to one K(2), two equivalent K(1), and one Th(1) atom to form FK3Th tetrahedra that share  a cornercorner with one F(6)K2Th2 tetrahedra, corners with two equivalent F(2)K3Th tetrahedra, corners with two equivalent F(5)K3Th tetrahedra, corners with three equivalent F(4)K2Th2 tetrahedra, corners with three equivalent F(9)K3Th tetrahedra,  an edgeedge with one F(2)K3Th tetrahedra, edges with two equivalent F(6)K2Th2 tetrahedra, and edges with two equivalent F(8)K3Th tetrahedra. In the sixth F site, F(6) is bonded to two equivalent K(1), one Th(1), and one Th(2) atom to form FK2Th2 tetrahedra that share  a cornercorner with one F(5)K3Th tetrahedra,  a cornercorner with one F(9)K3Th tetrahedra, corners with two equivalent F(6)K2Th2 tetrahedra, corners with three equivalent F(2)K3Th tetrahedra, corners with three equivalent F(8)K3Th tetrahedra,  an edgeedge with one F(4)K2Th2 tetrahedra,  an edgeedge with one F(9)K3Th tetrahedra, and edges with two equivalent F(5)K3Th tetrahedra. In the seventh F site, F(7) is bonded in a distorted bent 150 degrees geometry to two equivalent Th(1) atoms. In the eighth F site, F(8) is bonded to one K(1), one K(2), one K(3), and one Th(1) atom to form FK3Th tetrahedra that share  a cornercorner with one F(4)K2Th2 tetrahedra,  a cornercorner with one F(9)K3Th tetrahedra, corners with two equivalent F(8)K3Th tetrahedra, corners with three equivalent F(6)K2Th2 tetrahedra, corners with three equivalent F(2)K3Th tetrahedra,  an edgeedge with one F(4)K2Th2 tetrahedra, edges with two equivalent F(5)K3Th tetrahedra, and edges with two equivalent F(9)K3Th tetrahedra. In the ninth F site, F(9) is bonded to one K(1), one K(2), one K(3), and one Th(2) atom to form FK3Th tetrahedra that share  a cornercorner with one F(6)K2Th2 tetrahedra,  a cornercorner with one F(8)K3Th tetrahedra, corners with two equivalent F(9)K3Th tetrahedra, corners with three equivalent F(4)K2Th2 tetrahedra, corners with three equivalent F(5)K3Th tetrahedra,  an edgeedge with one F(6)K2Th2 tetrahedra, edges with two equivalent F(2)K3Th tetrahedra, and edges with two equivalent F(8)K3Th tetrahedra. In the tenth F site, F(10) is bonded in a 3-coordinate geometry to one K(1) and two equivalent Th(2) atoms. In the eleventh F site, F(11) is bonded in a trigonal non-coplanar geometry to three equivalent Th(2) atoms.
K7Th6F31 crystallizes in the trigonal R3 space group. There are three inequivalent K sites. In the first K site, K(1) is bonded in a 8-coordinate geometry to one F(10), one F(2), one F(8), one F(9), two equivalent F(5), and two equivalent F(6) atoms. The K(1)-F(10) bond length is 2.95 Å. The K(1)-F(2) bond length is 2.71 Å. The K(1)-F(8) bond length is 2.77 Å. The K(1)-F(9) bond length is 2.64 Å. There is one shorter (2.67 Å) and one longer (2.69 Å) K(1)-F(5) bond length. There is one shorter (2.75 Å) and one longer (2.78 Å) K(1)-F(6) bond length. In the second K site, K(2) is bonded in a 7-coordinate geometry to one F(5), one F(8), one F(9), two equivalent F(2), and two equivalent F(4) atoms. The K(2)-F(5) bond length is 2.69 Å. The K(2)-F(8) bond length is 2.68 Å. The K(2)-F(9) bond length is 2.70 Å. There is one shorter (2.63 Å) and one longer (2.68 Å) K(2)-F(2) bond length. There is one shorter (2.79 Å) and one longer (2.80 Å) K(2)-F(4) bond length. In the third K site, K(3) is bonded in a 6-coordinate geometry to three equivalent F(8) and three equivalent F(9) atoms. All K(3)-F(8) bond lengths are 2.70 Å. All K(3)-F(9) bond lengths are 2.73 Å. There are two inequivalent Th sites. In the first Th site, Th(1) is bonded in a 8-coordinate geometry to one F(1), one F(3), one F(4), one F(5), one F(6), one F(8), and two equivalent F(7) atoms. The Th(1)-F(1) bond length is 2.38 Å. The Th(1)-F(3) bond length is 2.36 Å. The Th(1)-F(4) bond length is 2.37 Å. The Th(1)-F(5) bond length is 2.24 Å. The Th(1)-F(6) bond length is 2.36 Å. The Th(1)-F(8) bond length is 2.24 Å. There is one shorter (2.36 Å) and one longer (2.37 Å) Th(1)-F(7) bond length. In the second Th site, Th(2) is bonded in a 9-coordinate geometry to one F(1), one F(11), one F(2), one F(3), one F(4), one F(6), one F(9), and two equivalent F(10) atoms. The Th(2)-F(1) bond length is 2.36 Å. The Th(2)-F(11) bond length is 2.66 Å. The Th(2)-F(2) bond length is 2.25 Å. The Th(2)-F(3) bond length is 2.41 Å. The Th(2)-F(4) bond length is 2.46 Å. The Th(2)-F(6) bond length is 2.43 Å. The Th(2)-F(9) bond length is 2.25 Å. There is one shorter (2.35 Å) and one longer (2.38 Å) Th(2)-F(10) bond length. There are eleven inequivalent F sites. In the first F site, F(1) is bonded in a bent 150 degrees geometry to one Th(1) and one Th(2) atom. In the second F site, F(2) is bonded to one K(1), two equivalent K(2), and one Th(2) atom to form FK3Th tetrahedra that share  a cornercorner with one F(4)K2Th2 tetrahedra, corners with two equivalent F(2)K3Th tetrahedra, corners with two equivalent F(5)K3Th tetrahedra, corners with three equivalent F(6)K2Th2 tetrahedra, corners with three equivalent F(8)K3Th tetrahedra,  an edgeedge with one F(5)K3Th tetrahedra, edges with two equivalent F(4)K2Th2 tetrahedra, and edges with two equivalent F(9)K3Th tetrahedra. In the third F site, F(3) is bonded in a bent 150 degrees geometry to one Th(1) and one Th(2) atom. In the fourth F site, F(4) is bonded to two equivalent K(2), one Th(1), and one Th(2) atom to form FK2Th2 tetrahedra that share  a cornercorner with one F(2)K3Th tetrahedra,  a cornercorner with one F(8)K3Th tetrahedra, corners with two equivalent F(4)K2Th2 tetrahedra, corners with three equivalent F(5)K3Th tetrahedra, corners with three equivalent F(9)K3Th tetrahedra,  an edgeedge with one F(6)K2Th2 tetrahedra,  an edgeedge with one F(8)K3Th tetrahedra, and edges with two equivalent F(2)K3Th tetrahedra. In the fifth F site, F(5) is bonded to one K(2), two equivalent K(1), and one Th(1) atom to form FK3Th tetrahedra that share  a cornercorner with one F(6)K2Th2 tetrahedra, corners with two equivalent F(2)K3Th tetrahedra, corners with two equivalent F(5)K3Th tetrahedra, corners with three equivalent F(4)K2Th2 tetrahedra, corners with three equivalent F(9)K3Th tetrahedra,  an edgeedge with one F(2)K3Th tetrahedra, edges with two equivalent F(6)K2Th2 tetrahedra, and edges with two equivalent F(8)K3Th tetrahedra. In the sixth F site, F(6) is bonded to two equivalent K(1), one Th(1), and one Th(2) atom to form FK2Th2 tetrahedra that share  a cornercorner with one F(5)K3Th tetrahedra,  a cornercorner with one F(9)K3Th tetrahedra, corners with two equivalent F(6)K2Th2 tetrahedra, corners with three equivalent F(2)K3Th tetrahedra, corners with three equivalent F(8)K3Th tetrahedra,  an edgeedge with one F(4)K2Th2 tetrahedra,  an edgeedge with one F(9)K3Th tetrahedra, and edges with two equivalent F(5)K3Th tetrahedra. In the seventh F site, F(7) is bonded in a distorted bent 150 degrees geometry to two equivalent Th(1) atoms. In the eighth F site, F(8) is bonded to one K(1), one K(2), one K(3), and one Th(1) atom to form FK3Th tetrahedra that share  a cornercorner with one F(4)K2Th2 tetrahedra,  a cornercorner with one F(9)K3Th tetrahedra, corners with two equivalent F(8)K3Th tetrahedra, corners with three equivalent F(6)K2Th2 tetrahedra, corners with three equivalent F(2)K3Th tetrahedra,  an edgeedge with one F(4)K2Th2 tetrahedra, edges with two equivalent F(5)K3Th tetrahedra, and edges with two equivalent F(9)K3Th tetrahedra. In the ninth F site, F(9) is bonded to one K(1), one K(2), one K(3), and one Th(2) atom to form FK3Th tetrahedra that share  a cornercorner with one F(6)K2Th2 tetrahedra,  a cornercorner with one F(8)K3Th tetrahedra, corners with two equivalent F(9)K3Th tetrahedra, corners with three equivalent F(4)K2Th2 tetrahedra, corners with three equivalent F(5)K3Th tetrahedra,  an edgeedge with one F(6)K2Th2 tetrahedra, edges with two equivalent F(2)K3Th tetrahedra, and edges with two equivalent F(8)K3Th tetrahedra. In the tenth F site, F(10) is bonded in a 3-coordinate geometry to one K(1) and two equivalent Th(2) atoms. In the eleventh F site, F(11) is bonded in a trigonal non-coplanar geometry to three equivalent Th(2) atoms.