CaMg5 is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the monoclinic Cm space group. Ca(1) is bonded to two equivalent Ca(1), one Mg(4), two equivalent Mg(1), two equivalent Mg(3), two equivalent Mg(5), and three equivalent Mg(2) atoms to form CaCa2Mg10 cuboctahedra that share corners with six equivalent Ca(1)Ca2Mg10 cuboctahedra, corners with six equivalent Mg(3)Ca2Mg10 cuboctahedra, edges with two equivalent Mg(2)Ca3Mg9 cuboctahedra, edges with three equivalent Mg(3)Ca2Mg10 cuboctahedra, faces with two equivalent Ca(1)Ca2Mg10 cuboctahedra, faces with three equivalent Mg(3)Ca2Mg10 cuboctahedra, and faces with five equivalent Mg(2)Ca3Mg9 cuboctahedra. There are five inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 11-coordinate geometry to two equivalent Ca(1), one Mg(3), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and two equivalent Mg(5) atoms. In the second Mg site, Mg(2) is bonded to three equivalent Ca(1), one Mg(5), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), and two equivalent Mg(4) atoms to form MgCa3Mg9 cuboctahedra that share corners with six equivalent Mg(2)Ca3Mg9 cuboctahedra, edges with two equivalent Ca(1)Ca2Mg10 cuboctahedra, edges with six equivalent Mg(3)Ca2Mg10 cuboctahedra, faces with two equivalent Mg(2)Ca3Mg9 cuboctahedra, faces with three equivalent Mg(3)Ca2Mg10 cuboctahedra, and faces with five equivalent Ca(1)Ca2Mg10 cuboctahedra. In the third Mg site, Mg(3) is bonded to two equivalent Ca(1), one Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(5), and three equivalent Mg(4) atoms to form distorted MgCa2Mg10 cuboctahedra that share corners with six equivalent Ca(1)Ca2Mg10 cuboctahedra, corners with six equivalent Mg(3)Ca2Mg10 cuboctahedra, edges with three equivalent Ca(1)Ca2Mg10 cuboctahedra, edges with six equivalent Mg(2)Ca3Mg9 cuboctahedra, faces with two equivalent Mg(3)Ca2Mg10 cuboctahedra, faces with three equivalent Ca(1)Ca2Mg10 cuboctahedra, and faces with three equivalent Mg(2)Ca3Mg9 cuboctahedra. In the fourth Mg site, Mg(4) is bonded in a 12-coordinate geometry to one Ca(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), and three equivalent Mg(3) atoms. In the fifth Mg site, Mg(5) is bonded in a 11-coordinate geometry to two equivalent Ca(1), one Mg(2), two equivalent Mg(1), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Mg(5) atoms.
CaMg5 is Bergman Structure: Mg32(Al,Zn)49 Bergman-derived structured and crystallizes in the monoclinic Cm space group. Ca(1) is bonded to two equivalent Ca(1), one Mg(4), two equivalent Mg(1), two equivalent Mg(3), two equivalent Mg(5), and three equivalent Mg(2) atoms to form CaCa2Mg10 cuboctahedra that share corners with six equivalent Ca(1)Ca2Mg10 cuboctahedra, corners with six equivalent Mg(3)Ca2Mg10 cuboctahedra, edges with two equivalent Mg(2)Ca3Mg9 cuboctahedra, edges with three equivalent Mg(3)Ca2Mg10 cuboctahedra, faces with two equivalent Ca(1)Ca2Mg10 cuboctahedra, faces with three equivalent Mg(3)Ca2Mg10 cuboctahedra, and faces with five equivalent Mg(2)Ca3Mg9 cuboctahedra. Both Ca(1)-Ca(1) bond lengths are 3.31 Å. The Ca(1)-Mg(4) bond length is 3.31 Å. Both Ca(1)-Mg(1) bond lengths are 3.36 Å. Both Ca(1)-Mg(3) bond lengths are 3.43 Å. Both Ca(1)-Mg(5) bond lengths are 3.36 Å. There is one shorter (3.41 Å) and two longer (3.44 Å) Ca(1)-Mg(2) bond lengths. There are five inequivalent Mg sites. In the first Mg site, Mg(1) is bonded in a 11-coordinate geometry to two equivalent Ca(1), one Mg(3), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), and two equivalent Mg(5) atoms. The Mg(1)-Mg(3) bond length is 3.07 Å. Both Mg(1)-Mg(1) bond lengths are 3.31 Å. Both Mg(1)-Mg(2) bond lengths are 3.31 Å. Both Mg(1)-Mg(4) bond lengths are 3.27 Å. Both Mg(1)-Mg(5) bond lengths are 3.22 Å. In the second Mg site, Mg(2) is bonded to three equivalent Ca(1), one Mg(5), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(3), and two equivalent Mg(4) atoms to form MgCa3Mg9 cuboctahedra that share corners with six equivalent Mg(2)Ca3Mg9 cuboctahedra, edges with two equivalent Ca(1)Ca2Mg10 cuboctahedra, edges with six equivalent Mg(3)Ca2Mg10 cuboctahedra, faces with two equivalent Mg(2)Ca3Mg9 cuboctahedra, faces with three equivalent Mg(3)Ca2Mg10 cuboctahedra, and faces with five equivalent Ca(1)Ca2Mg10 cuboctahedra. The Mg(2)-Mg(5) bond length is 3.28 Å. Both Mg(2)-Mg(2) bond lengths are 3.31 Å. Both Mg(2)-Mg(3) bond lengths are 3.19 Å. Both Mg(2)-Mg(4) bond lengths are 3.37 Å. In the third Mg site, Mg(3) is bonded to two equivalent Ca(1), one Mg(1), two equivalent Mg(2), two equivalent Mg(3), two equivalent Mg(5), and three equivalent Mg(4) atoms to form distorted MgCa2Mg10 cuboctahedra that share corners with six equivalent Ca(1)Ca2Mg10 cuboctahedra, corners with six equivalent Mg(3)Ca2Mg10 cuboctahedra, edges with three equivalent Ca(1)Ca2Mg10 cuboctahedra, edges with six equivalent Mg(2)Ca3Mg9 cuboctahedra, faces with two equivalent Mg(3)Ca2Mg10 cuboctahedra, faces with three equivalent Ca(1)Ca2Mg10 cuboctahedra, and faces with three equivalent Mg(2)Ca3Mg9 cuboctahedra. Both Mg(3)-Mg(3) bond lengths are 3.31 Å. Both Mg(3)-Mg(5) bond lengths are 3.14 Å. There is one shorter (3.35 Å) and two longer (3.48 Å) Mg(3)-Mg(4) bond lengths. In the fourth Mg site, Mg(4) is bonded in a 12-coordinate geometry to one Ca(1), two equivalent Mg(1), two equivalent Mg(2), two equivalent Mg(4), two equivalent Mg(5), and three equivalent Mg(3) atoms. Both Mg(4)-Mg(4) bond lengths are 3.31 Å. Both Mg(4)-Mg(5) bond lengths are 3.21 Å. In the fifth Mg site, Mg(5) is bonded in a 11-coordinate geometry to two equivalent Ca(1), one Mg(2), two equivalent Mg(1), two equivalent Mg(3), two equivalent Mg(4), and two equivalent Mg(5) atoms. Both Mg(5)-Mg(5) bond lengths are 3.31 Å.