MgRb crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 4-coordinate geometry to two equivalent Mg(1) and two equivalent Mg(2) atoms. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to two equivalent Mg(2) and four equivalent Mg(1) atoms. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 8-coordinate geometry to one Rb(1), four equivalent Rb(2), one Mg(1), and two equivalent Mg(2) atoms. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Rb(1), four equivalent Rb(2), and four equivalent Mg(1) atoms.
MgRb crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Rb sites. In the first Rb site, Rb(1) is bonded in a 4-coordinate geometry to two equivalent Mg(1) and two equivalent Mg(2) atoms. Both Rb(1)-Mg(1) bond lengths are 4.03 Å. Both Rb(1)-Mg(2) bond lengths are 4.25 Å. In the second Rb site, Rb(2) is bonded in a 6-coordinate geometry to two equivalent Mg(2) and four equivalent Mg(1) atoms. There is one shorter (4.01 Å) and one longer (4.06 Å) Rb(2)-Mg(2) bond length. There are two shorter (4.02 Å) and two longer (4.06 Å) Rb(2)-Mg(1) bond lengths. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 8-coordinate geometry to one Rb(1), four equivalent Rb(2), one Mg(1), and two equivalent Mg(2) atoms. The Mg(1)-Mg(1) bond length is 3.03 Å. Both Mg(1)-Mg(2) bond lengths are 3.14 Å. In the second Mg site, Mg(2) is bonded in a 10-coordinate geometry to two equivalent Rb(1), four equivalent Rb(2), and four equivalent Mg(1) atoms.