RbNaMg6 crystallizes in the orthorhombic Amm2 space group. Rb(1) is bonded to two equivalent Na(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form a mixture of face and corner-sharing RbNa2Mg10 cuboctahedra. Na(1) is bonded in a 10-coordinate geometry to two equivalent Rb(1), two equivalent Mg(2), four equivalent Mg(1), and four equivalent Mg(3) atoms. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 11-coordinate geometry to two equivalent Rb(1), two equivalent Na(1), one Mg(1), two equivalent Mg(2), two equivalent Mg(3), and two equivalent Mg(4) atoms. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Na(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms. In the third Mg site, Mg(3) is bonded in a 4-coordinate geometry to two equivalent Rb(1), two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), and two equivalent Mg(4) atoms. In the fourth Mg site, Mg(4) is bonded in a 12-coordinate geometry to two equivalent Rb(1), two equivalent Mg(2), four equivalent Mg(1), and four equivalent Mg(3) atoms.
RbNaMg6 crystallizes in the orthorhombic Amm2 space group. Rb(1) is bonded to two equivalent Na(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms to form a mixture of face and corner-sharing RbNa2Mg10 cuboctahedra. Both Rb(1)-Na(1) bond lengths are 3.39 Å. Both Rb(1)-Mg(4) bond lengths are 3.58 Å. All Rb(1)-Mg(1) bond lengths are 3.58 Å. There are two shorter (3.47 Å) and two longer (3.54 Å) Rb(1)-Mg(3) bond lengths. Na(1) is bonded in a 10-coordinate geometry to two equivalent Rb(1), two equivalent Mg(2), four equivalent Mg(1), and four equivalent Mg(3) atoms. Both Na(1)-Mg(2) bond lengths are 3.58 Å. There are two shorter (3.21 Å) and two longer (3.79 Å) Na(1)-Mg(1) bond lengths. All Na(1)-Mg(3) bond lengths are 3.44 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 11-coordinate geometry to two equivalent Rb(1), two equivalent Na(1), one Mg(1), two equivalent Mg(2), two equivalent Mg(3), and two equivalent Mg(4) atoms. The Mg(1)-Mg(1) bond length is 3.16 Å. There is one shorter (3.51 Å) and one longer (3.52 Å) Mg(1)-Mg(2) bond length. Both Mg(1)-Mg(3) bond lengths are 3.28 Å. Both Mg(1)-Mg(4) bond lengths are 3.33 Å. In the second Mg site, Mg(2) is bonded in a 12-coordinate geometry to two equivalent Na(1), two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(3) atoms. Both Mg(2)-Mg(4) bond lengths are 3.40 Å. All Mg(2)-Mg(3) bond lengths are 3.39 Å. In the third Mg site, Mg(3) is bonded in a 4-coordinate geometry to two equivalent Rb(1), two equivalent Na(1), two equivalent Mg(1), two equivalent Mg(2), and two equivalent Mg(4) atoms. There is one shorter (3.44 Å) and one longer (3.57 Å) Mg(3)-Mg(4) bond length. In the fourth Mg site, Mg(4) is bonded in a 12-coordinate geometry to two equivalent Rb(1), two equivalent Mg(2), four equivalent Mg(1), and four equivalent Mg(3) atoms.