RbMg6Co crystallizes in the orthorhombic Amm2 space group. Rb(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Co(1) atoms to form RbMg10Co2 cuboctahedra that share corners with six equivalent Rb(1)Mg10Co2 cuboctahedra, edges with four equivalent Mg(4)Rb2Mg10 cuboctahedra, faces with two equivalent Rb(1)Mg10Co2 cuboctahedra, and faces with two equivalent Mg(4)Rb2Mg10 cuboctahedra. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and one Co(1) atom. In the second Mg site, Mg(2) is bonded in a 11-coordinate geometry to two equivalent Rb(1), one Mg(2), two equivalent Mg(1), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Co(1) atoms. In the third Mg site, Mg(3) is bonded in a distorted q6 geometry to two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(2) atoms. In the fourth Mg site, Mg(4) is bonded to two equivalent Rb(1), two equivalent Mg(3), four equivalent Mg(1), and four equivalent Mg(2) atoms to form distorted MgRb2Mg10 cuboctahedra that share corners with six equivalent Mg(4)Rb2Mg10 cuboctahedra, edges with four equivalent Rb(1)Mg10Co2 cuboctahedra, faces with two equivalent Rb(1)Mg10Co2 cuboctahedra, and faces with two equivalent Mg(4)Rb2Mg10 cuboctahedra. Co(1) is bonded in a 8-coordinate geometry to two equivalent Rb(1), two equivalent Mg(1), and four equivalent Mg(2) atoms.
RbMg6Co crystallizes in the orthorhombic Amm2 space group. Rb(1) is bonded to two equivalent Mg(4), four equivalent Mg(1), four equivalent Mg(2), and two equivalent Co(1) atoms to form RbMg10Co2 cuboctahedra that share corners with six equivalent Rb(1)Mg10Co2 cuboctahedra, edges with four equivalent Mg(4)Rb2Mg10 cuboctahedra, faces with two equivalent Rb(1)Mg10Co2 cuboctahedra, and faces with two equivalent Mg(4)Rb2Mg10 cuboctahedra. Both Rb(1)-Mg(4) bond lengths are 3.37 Å. There are two shorter (3.21 Å) and two longer (3.27 Å) Rb(1)-Mg(1) bond lengths. All Rb(1)-Mg(2) bond lengths are 3.30 Å. Both Rb(1)-Co(1) bond lengths are 3.35 Å. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a distorted single-bond geometry to two equivalent Rb(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(4), and one Co(1) atom. Both Mg(1)-Mg(2) bond lengths are 3.28 Å. Both Mg(1)-Mg(3) bond lengths are 3.26 Å. Both Mg(1)-Mg(4) bond lengths are 3.18 Å. The Mg(1)-Co(1) bond length is 2.58 Å. In the second Mg site, Mg(2) is bonded in a 11-coordinate geometry to two equivalent Rb(1), one Mg(2), two equivalent Mg(1), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Co(1) atoms. The Mg(2)-Mg(2) bond length is 2.93 Å. There is one shorter (3.15 Å) and one longer (3.33 Å) Mg(2)-Mg(3) bond length. There is one shorter (3.08 Å) and one longer (3.40 Å) Mg(2)-Mg(4) bond length. Both Mg(2)-Co(1) bond lengths are 3.03 Å. In the third Mg site, Mg(3) is bonded in a distorted q6 geometry to two equivalent Mg(4), four equivalent Mg(1), and four equivalent Mg(2) atoms. Both Mg(3)-Mg(4) bond lengths are 3.28 Å. In the fourth Mg site, Mg(4) is bonded to two equivalent Rb(1), two equivalent Mg(3), four equivalent Mg(1), and four equivalent Mg(2) atoms to form distorted MgRb2Mg10 cuboctahedra that share corners with six equivalent Mg(4)Rb2Mg10 cuboctahedra, edges with four equivalent Rb(1)Mg10Co2 cuboctahedra, faces with two equivalent Rb(1)Mg10Co2 cuboctahedra, and faces with two equivalent Mg(4)Rb2Mg10 cuboctahedra. Co(1) is bonded in a 8-coordinate geometry to two equivalent Rb(1), two equivalent Mg(1), and four equivalent Mg(2) atoms.