Mg3Ir crystallizes in the hexagonal P6_3cm space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 2-coordinate geometry to two equivalent Ir(1) atoms. In the second Mg site, Mg(2) is bonded in a trigonal planar geometry to three equivalent Ir(1) atoms. In the third Mg site, Mg(3) is bonded in a distorted trigonal planar geometry to three equivalent Ir(1) atoms. In the fourth Mg site, Mg(4) is bonded in a distorted trigonal planar geometry to three equivalent Ir(1) atoms. Ir(1) is bonded in a 8-coordinate geometry to one Mg(3), two equivalent Mg(1), two equivalent Mg(2), and three equivalent Mg(4) atoms.
Mg3Ir crystallizes in the hexagonal P6_3cm space group. There are four inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 2-coordinate geometry to two equivalent Ir(1) atoms. There is one shorter (2.71 Å) and one longer (2.75 Å) Mg(1)-Ir(1) bond length. In the second Mg site, Mg(2) is bonded in a trigonal planar geometry to three equivalent Ir(1) atoms. All Mg(2)-Ir(1) bond lengths are 2.66 Å. In the third Mg site, Mg(3) is bonded in a distorted trigonal planar geometry to three equivalent Ir(1) atoms. All Mg(3)-Ir(1) bond lengths are 2.64 Å. In the fourth Mg site, Mg(4) is bonded in a distorted trigonal planar geometry to three equivalent Ir(1) atoms. There is one shorter (2.72 Å) and two longer (2.81 Å) Mg(4)-Ir(1) bond lengths. Ir(1) is bonded in a 8-coordinate geometry to one Mg(3), two equivalent Mg(1), two equivalent Mg(2), and three equivalent Mg(4) atoms.