RbKMg6 crystallizes in the orthorhombic Amm2 space group. Rb(1) is bonded in a 10-coordinate geometry to two equivalent K(1); two Mg(1,1); two equivalent Mg(4); and four Mg(2,2) atoms. K(1) is bonded in a 8-coordinate geometry to two equivalent Rb(1); two Mg(1,1); two equivalent Mg(3); and four Mg(2,2) atoms. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to one Rb(1), one K(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), and two equivalent Mg(4) atoms. In the second Mg site, Mg(1) is bonded in a 10-coordinate geometry to one Rb(1), one K(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), and two equivalent Mg(4) atoms. In the third Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Rb(1), two equivalent K(1), one Mg(3), one Mg(4), two equivalent Mg(1), and two equivalent Mg(2) atoms. In the fourth Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Rb(1), two equivalent K(1), one Mg(3), one Mg(4), two equivalent Mg(1), and two equivalent Mg(2) atoms. In the fifth Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent K(1); two Mg(2,2); two equivalent Mg(4); and four Mg(1,1) atoms. In the sixth Mg site, Mg(4) is bonded in a 10-coordinate geometry to two equivalent Rb(1); two Mg(2,2); two equivalent Mg(3); and four Mg(1,1) atoms. In the seventh Mg site, Mg(1) is bonded in a 10-coordinate geometry to one Rb(1), one K(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), and two equivalent Mg(4) atoms.
RbKMg6 crystallizes in the orthorhombic Amm2 space group. Rb(1) is bonded in a 10-coordinate geometry to two equivalent K(1); two Mg(1,1); two equivalent Mg(4); and four Mg(2,2) atoms. Both Rb(1)-K(1) bond lengths are 3.31 Å. Both Rb(1)-Mg(1,1) bond lengths are 4.06 Å. Both Rb(1)-Mg(4) bond lengths are 3.80 Å. All Rb(1)-Mg(2,2) bond lengths are 3.83 Å. K(1) is bonded in a 8-coordinate geometry to two equivalent Rb(1); two Mg(1,1); two equivalent Mg(3); and four Mg(2,2) atoms. Both K(1)-Mg(1,1) bond lengths are 4.09 Å. Both K(1)-Mg(3) bond lengths are 3.78 Å. All K(1)-Mg(2,2) bond lengths are 3.79 Å. There are seven inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 10-coordinate geometry to one Rb(1), one K(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), and two equivalent Mg(4) atoms. There is one shorter (3.30 Å) and one longer (3.32 Å) Mg(1)-Mg(1) bond length. Both Mg(1)-Mg(2) bond lengths are 3.12 Å. Both Mg(1)-Mg(3) bond lengths are 3.25 Å. Both Mg(1)-Mg(4) bond lengths are 3.22 Å. In the second Mg site, Mg(1) is bonded in a 10-coordinate geometry to one Rb(1), one K(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), and two equivalent Mg(4) atoms. Both Mg(1)-Mg(2) bond lengths are 3.12 Å. Both Mg(1)-Mg(3) bond lengths are 3.25 Å. Both Mg(1)-Mg(4) bond lengths are 3.22 Å. In the third Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Rb(1), two equivalent K(1), one Mg(3), one Mg(4), two equivalent Mg(1), and two equivalent Mg(2) atoms. The Mg(2)-Mg(3) bond length is 3.19 Å. The Mg(2)-Mg(4) bond length is 3.12 Å. There is one shorter (3.28 Å) and one longer (3.35 Å) Mg(2)-Mg(2) bond length. In the fourth Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Rb(1), two equivalent K(1), one Mg(3), one Mg(4), two equivalent Mg(1), and two equivalent Mg(2) atoms. The Mg(2)-Mg(3) bond length is 3.19 Å. The Mg(2)-Mg(4) bond length is 3.12 Å. Both Mg(2)-Mg(1) bond lengths are 3.12 Å. In the fifth Mg site, Mg(3) is bonded in a 10-coordinate geometry to two equivalent K(1); two Mg(2,2); two equivalent Mg(4); and four Mg(1,1) atoms. Both Mg(3)-Mg(4) bond lengths are 3.31 Å. In the sixth Mg site, Mg(4) is bonded in a 10-coordinate geometry to two equivalent Rb(1); two Mg(2,2); two equivalent Mg(3); and four Mg(1,1) atoms. In the seventh Mg site, Mg(1) is bonded in a 10-coordinate geometry to one Rb(1), one K(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), and two equivalent Mg(4) atoms. The Mg(1)-Rb(1) bond length is 4.06 Å. The Mg(1)-K(1) bond length is 4.09 Å. There is one shorter (3.30 Å) and one longer (3.32 Å) Mg(1)-Mg(1) bond length. Both Mg(1)-Mg(3) bond lengths are 3.25 Å. Both Mg(1)-Mg(4) bond lengths are 3.22 Å.