K6Mg(SbO4)2 crystallizes in the triclinic P1 space group. There are six inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one Mg(1), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. In the second K site, K(2) is bonded to one O(2), one O(3), one O(5), and one O(6) atom to form distorted KO4 tetrahedra that share corners with two equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-24°. In the third K site, K(3) is bonded in a 5-coordinate geometry to one O(3), one O(4), one O(5), one O(7), and one O(8) atom. In the fourth K site, K(4) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and one O(6) atom. In the fifth K site, K(5) is bonded in a 3-coordinate geometry to one O(1), one O(3), one O(4), and one O(7) atom. In the sixth K site, K(6) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(6), one O(7), and one O(8) atom. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one O(3), one O(4), one O(6), and one O(7) atom. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form SbO6 octahedra that share corners with two equivalent K(2)O4 tetrahedra. In the second Sb site, Sb(2) is bonded in a distorted trigonal non-coplanar geometry to one O(2), one O(5), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one K(4), one K(5), one K(6), and one Sb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one K(2), one K(4), one K(6), one Sb(1), and one Sb(2) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one K(1), one K(2), one K(3), one K(5), one Mg(1), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one K(1), one K(3), one K(4), one K(5), one Mg(1), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one K(1), one K(2), one K(3), one K(4), one K(6), and one Sb(2) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one K(1), one K(2), one K(4), one K(6), and one Mg(1) atom. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one K(1), one K(3), one K(5), one K(6), one Mg(1), and one Sb(1) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one K(1), one K(3), one K(6), one Sb(1), and one Sb(2) atom.
K6Mg(SbO4)2 crystallizes in the triclinic P1 space group. There are six inequivalent K sites. In the first K site, K(1) is bonded in a 7-coordinate geometry to one Mg(1), one O(3), one O(4), one O(5), one O(6), one O(7), and one O(8) atom. The K(1)-Mg(1) bond length is 2.78 Å. The K(1)-O(3) bond length is 2.84 Å. The K(1)-O(4) bond length is 2.58 Å. The K(1)-O(5) bond length is 3.22 Å. The K(1)-O(6) bond length is 2.92 Å. The K(1)-O(7) bond length is 2.81 Å. The K(1)-O(8) bond length is 2.67 Å. In the second K site, K(2) is bonded to one O(2), one O(3), one O(5), and one O(6) atom to form distorted KO4 tetrahedra that share corners with two equivalent Sb(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 13-24°. The K(2)-O(2) bond length is 3.17 Å. The K(2)-O(3) bond length is 3.07 Å. The K(2)-O(5) bond length is 2.65 Å. The K(2)-O(6) bond length is 2.55 Å. In the third K site, K(3) is bonded in a 5-coordinate geometry to one O(3), one O(4), one O(5), one O(7), and one O(8) atom. The K(3)-O(3) bond length is 2.63 Å. The K(3)-O(4) bond length is 2.76 Å. The K(3)-O(5) bond length is 3.16 Å. The K(3)-O(7) bond length is 2.93 Å. The K(3)-O(8) bond length is 2.73 Å. In the fourth K site, K(4) is bonded in a 5-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and one O(6) atom. The K(4)-O(1) bond length is 2.59 Å. The K(4)-O(2) bond length is 2.92 Å. The K(4)-O(4) bond length is 2.73 Å. The K(4)-O(5) bond length is 2.85 Å. The K(4)-O(6) bond length is 2.85 Å. In the fifth K site, K(5) is bonded in a 3-coordinate geometry to one O(1), one O(3), one O(4), and one O(7) atom. The K(5)-O(1) bond length is 2.74 Å. The K(5)-O(3) bond length is 2.75 Å. The K(5)-O(4) bond length is 3.22 Å. The K(5)-O(7) bond length is 2.69 Å. In the sixth K site, K(6) is bonded in a 6-coordinate geometry to one O(1), one O(2), one O(5), one O(6), one O(7), and one O(8) atom. The K(6)-O(1) bond length is 2.84 Å. The K(6)-O(2) bond length is 2.75 Å. The K(6)-O(5) bond length is 3.26 Å. The K(6)-O(6) bond length is 2.60 Å. The K(6)-O(7) bond length is 2.87 Å. The K(6)-O(8) bond length is 2.94 Å. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one K(1), one O(3), one O(4), one O(6), and one O(7) atom. The Mg(1)-O(3) bond length is 2.02 Å. The Mg(1)-O(4) bond length is 2.01 Å. The Mg(1)-O(6) bond length is 1.87 Å. The Mg(1)-O(7) bond length is 2.13 Å. There are two inequivalent Sb sites. In the first Sb site, Sb(1) is bonded to one O(1), one O(2), one O(3), one O(4), one O(7), and one O(8) atom to form SbO6 octahedra that share corners with two equivalent K(2)O4 tetrahedra. The Sb(1)-O(1) bond length is 1.96 Å. The Sb(1)-O(2) bond length is 2.10 Å. The Sb(1)-O(3) bond length is 2.14 Å. The Sb(1)-O(4) bond length is 2.07 Å. The Sb(1)-O(7) bond length is 2.01 Å. The Sb(1)-O(8) bond length is 2.20 Å. In the second Sb site, Sb(2) is bonded in a distorted trigonal non-coplanar geometry to one O(2), one O(5), and one O(8) atom. The Sb(2)-O(2) bond length is 2.09 Å. The Sb(2)-O(5) bond length is 1.95 Å. The Sb(2)-O(8) bond length is 2.04 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one K(4), one K(5), one K(6), and one Sb(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to one K(2), one K(4), one K(6), one Sb(1), and one Sb(2) atom. In the third O site, O(3) is bonded in a 6-coordinate geometry to one K(1), one K(2), one K(3), one K(5), one Mg(1), and one Sb(1) atom. In the fourth O site, O(4) is bonded in a 6-coordinate geometry to one K(1), one K(3), one K(4), one K(5), one Mg(1), and one Sb(1) atom. In the fifth O site, O(5) is bonded in a 6-coordinate geometry to one K(1), one K(2), one K(3), one K(4), one K(6), and one Sb(2) atom. In the sixth O site, O(6) is bonded in a 1-coordinate geometry to one K(1), one K(2), one K(4), one K(6), and one Mg(1) atom. In the seventh O site, O(7) is bonded in a 6-coordinate geometry to one K(1), one K(3), one K(5), one K(6), one Mg(1), and one Sb(1) atom. In the eighth O site, O(8) is bonded in a 5-coordinate geometry to one K(1), one K(3), one K(6), one Sb(1), and one Sb(2) atom.