K6Mg(FeO3)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 3-coordinate geometry to one O(2), one O(4), one O(5), and one O(6) atom. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(6) atom. In the third K site, K(3) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and one O(6) atom. In the fourth K site, K(4) is bonded in a 5-coordinate geometry to one O(1), one O(3), 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), and one O(6) atom. In the sixth K site, K(6) is bonded in a 3-coordinate geometry to one O(2), one O(4), one O(5), and one O(6) atom. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(6) atom. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(6) atom. In the second Fe site, Fe(2) is bonded in a distorted tetrahedral geometry to one O(2), one O(3), one O(4), and one O(5) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one K(2), one K(3), one K(4), one K(5), one Mg(1), and one Fe(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one K(1), one K(3), one K(6), one Mg(1), one Fe(1), and one Fe(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one K(2), one K(4), one K(5), one Mg(1), one Fe(1), and one Fe(2) atom. In the fourth O site, O(4) 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 Fe(2) 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 Fe(2) atom. In the sixth O site, O(6) is bonded in a 8-coordinate geometry to one K(1), one K(2), one K(3), one K(4), one K(5), one K(6), one Mg(1), and one Fe(1) atom.
K6Mg(FeO3)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 3-coordinate geometry to one O(2), one O(4), one O(5), and one O(6) atom. The K(1)-O(2) bond length is 2.65 Å. The K(1)-O(4) bond length is 2.60 Å. The K(1)-O(5) bond length is 2.56 Å. The K(1)-O(6) bond length is 3.22 Å. In the second K site, K(2) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(6) atom. The K(2)-O(1) bond length is 2.69 Å. The K(2)-O(3) bond length is 3.02 Å. The K(2)-O(4) bond length is 2.74 Å. The K(2)-O(5) bond length is 2.83 Å. The K(2)-O(6) bond length is 3.10 Å. In the third K site, K(3) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(4), one O(5), and one O(6) atom. The K(3)-O(1) bond length is 2.79 Å. The K(3)-O(2) bond length is 3.06 Å. The K(3)-O(4) bond length is 2.69 Å. The K(3)-O(5) bond length is 2.85 Å. The K(3)-O(6) bond length is 3.33 Å. In the fourth K site, K(4) is bonded in a 5-coordinate geometry to one O(1), one O(3), one O(4), one O(5), and one O(6) atom. The K(4)-O(1) bond length is 2.82 Å. The K(4)-O(3) bond length is 2.94 Å. The K(4)-O(4) bond length is 2.91 Å. The K(4)-O(5) bond length is 2.80 Å. The K(4)-O(6) bond length is 2.79 Å. In the fifth K site, K(5) is bonded in a 3-coordinate geometry to one O(1), one O(3), and one O(6) atom. The K(5)-O(1) bond length is 2.91 Å. The K(5)-O(3) bond length is 2.54 Å. The K(5)-O(6) bond length is 2.90 Å. In the sixth K site, K(6) is bonded in a 3-coordinate geometry to one O(2), one O(4), one O(5), and one O(6) atom. The K(6)-O(2) bond length is 3.18 Å. The K(6)-O(4) bond length is 2.77 Å. The K(6)-O(5) bond length is 2.67 Å. The K(6)-O(6) bond length is 2.69 Å. Mg(1) is bonded in a distorted rectangular see-saw-like geometry to one O(1), one O(2), one O(3), and one O(6) atom. The Mg(1)-O(1) bond length is 2.00 Å. The Mg(1)-O(2) bond length is 2.01 Å. The Mg(1)-O(3) bond length is 1.99 Å. The Mg(1)-O(6) bond length is 2.12 Å. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded in a 4-coordinate geometry to one O(1), one O(2), one O(3), and one O(6) atom. The Fe(1)-O(1) bond length is 2.41 Å. The Fe(1)-O(2) bond length is 1.98 Å. The Fe(1)-O(3) bond length is 2.12 Å. The Fe(1)-O(6) bond length is 1.98 Å. In the second Fe site, Fe(2) is bonded in a distorted tetrahedral geometry to one O(2), one O(3), one O(4), and one O(5) atom. The Fe(2)-O(2) bond length is 2.26 Å. The Fe(2)-O(3) bond length is 2.18 Å. The Fe(2)-O(4) bond length is 1.96 Å. The Fe(2)-O(5) bond length is 1.96 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to one K(2), one K(3), one K(4), one K(5), one Mg(1), and one Fe(1) atom. In the second O site, O(2) is bonded in a 6-coordinate geometry to one K(1), one K(3), one K(6), one Mg(1), one Fe(1), and one Fe(2) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one K(2), one K(4), one K(5), one Mg(1), one Fe(1), and one Fe(2) atom. In the fourth O site, O(4) 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 Fe(2) 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 Fe(2) atom. In the sixth O site, O(6) is bonded in a 8-coordinate geometry to one K(1), one K(2), one K(3), one K(4), one K(5), one K(6), one Mg(1), and one Fe(1) atom.