Mg2Cu is Khatyrkite-like structured and crystallizes in the orthorhombic Fddd space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 4-coordinate geometry to four equivalent Cu(1) atoms. In the second Mg site, Mg(2) is bonded in a 4-coordinate geometry to four equivalent Cu(1) atoms. Cu(1) is bonded in a 10-coordinate geometry to four equivalent Mg(1), four equivalent Mg(2), and two equivalent Cu(1) atoms.
Mg2Cu is Khatyrkite-like structured and crystallizes in the orthorhombic Fddd space group. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 4-coordinate geometry to four equivalent Cu(1) atoms. There are two shorter (2.68 Å) and two longer (2.72 Å) Mg(1)-Cu(1) bond lengths. In the second Mg site, Mg(2) is bonded in a 4-coordinate geometry to four equivalent Cu(1) atoms. There are two shorter (2.70 Å) and two longer (2.74 Å) Mg(2)-Cu(1) bond lengths. Cu(1) is bonded in a 10-coordinate geometry to four equivalent Mg(1), four equivalent Mg(2), and two equivalent Cu(1) atoms. Both Cu(1)-Cu(1) bond lengths are 2.59 Å.