Mg3Ca crystallizes in the hexagonal P6_3/mmc space group. Ca(1) is bonded to twelve equivalent Mg(1) atoms to form a mixture of corner and face-sharing CaMg12 cuboctahedra. Mg(1) is bonded in a 10-coordinate geometry to four equivalent Ca(1) and six equivalent Mg(1) atoms.
Mg3Ca crystallizes in the hexagonal P6_3/mmc space group. Ca(1) is bonded to twelve equivalent Mg(1) atoms to form a mixture of corner and face-sharing CaMg12 cuboctahedra. There are six shorter (3.35 Å) and six longer (3.41 Å) Ca(1)-Mg(1) bond lengths. Mg(1) is bonded in a 10-coordinate geometry to four equivalent Ca(1) and six equivalent Mg(1) atoms. There are four shorter (3.26 Å) and two longer (3.27 Å) Mg(1)-Mg(1) bond lengths.