Mg2Ca crystallizes in the monoclinic C2/m space group. Ca(1) is bonded in a 12-coordinate geometry to four equivalent Ca(1), three equivalent Mg(1), and five equivalent Mg(2) atoms. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 12-coordinate geometry to three equivalent Ca(1), four equivalent Mg(2), and five equivalent Mg(1) atoms. In the second Mg site, Mg(2) is bonded in a 9-coordinate geometry to five equivalent Ca(1) and four equivalent Mg(1) atoms.
Mg2Ca crystallizes in the monoclinic C2/m space group. Ca(1) is bonded in a 12-coordinate geometry to four equivalent Ca(1), three equivalent Mg(1), and five equivalent Mg(2) atoms. There are two shorter (3.55 Å) and two longer (3.73 Å) Ca(1)-Ca(1) bond lengths. There is one shorter (3.31 Å) and two longer (3.47 Å) Ca(1)-Mg(1) bond lengths. There are a spread of Ca(1)-Mg(2) bond distances ranging from 3.40-3.63 Å. There are two inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 12-coordinate geometry to three equivalent Ca(1), four equivalent Mg(2), and five equivalent Mg(1) atoms. There are two shorter (3.18 Å) and two longer (3.23 Å) Mg(1)-Mg(2) bond lengths. There are a spread of Mg(1)-Mg(1) bond distances ranging from 3.39-3.57 Å. In the second Mg site, Mg(2) is bonded in a 9-coordinate geometry to five equivalent Ca(1) and four equivalent Mg(1) atoms.