MgGa3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Mg(1) is bonded to twelve Ga(1,1) atoms to form MgGa12 cuboctahedra that share corners with six equivalent Mg(1)Ga12 cuboctahedra; corners with twelve equivalent Ga(1)Mg4Ga8 cuboctahedra; edges with eighteen Ga(1,1)Mg4Ga8 cuboctahedra; faces with eight equivalent Mg(1)Ga12 cuboctahedra; and faces with twelve Ga(1,1)Mg4Ga8 cuboctahedra. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to four equivalent Mg(1) and eight equivalent Ga(1) atoms to form distorted GaMg4Ga8 cuboctahedra that share corners with four equivalent Mg(1)Ga12 cuboctahedra; corners with fourteen equivalent Ga(1)Mg4Ga8 cuboctahedra; edges with six equivalent Mg(1)Ga12 cuboctahedra; edges with twelve equivalent Ga(1)Mg4Ga8 cuboctahedra; faces with four equivalent Mg(1)Ga12 cuboctahedra; and faces with sixteen Ga(1,1)Mg4Ga8 cuboctahedra. In the second Ga site, Ga(1) is bonded to four equivalent Mg(1) and eight equivalent Ga(1) atoms to form distorted GaMg4Ga8 cuboctahedra that share corners with four equivalent Mg(1)Ga12 cuboctahedra; corners with fourteen Ga(1,1)Mg4Ga8 cuboctahedra; edges with six equivalent Mg(1)Ga12 cuboctahedra; edges with twelve equivalent Ga(1)Mg4Ga8 cuboctahedra; faces with four equivalent Mg(1)Ga12 cuboctahedra; and faces with sixteen Ga(1,1)Mg4Ga8 cuboctahedra.
MgGa3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Mg(1) is bonded to twelve Ga(1,1) atoms to form MgGa12 cuboctahedra that share corners with six equivalent Mg(1)Ga12 cuboctahedra; corners with twelve equivalent Ga(1)Mg4Ga8 cuboctahedra; edges with eighteen Ga(1,1)Mg4Ga8 cuboctahedra; faces with eight equivalent Mg(1)Ga12 cuboctahedra; and faces with twelve Ga(1,1)Mg4Ga8 cuboctahedra. There are six shorter (2.93 Å) and six longer (2.97 Å) Mg(1)-Ga(1,1) bond lengths. There are two inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to four equivalent Mg(1) and eight equivalent Ga(1) atoms to form distorted GaMg4Ga8 cuboctahedra that share corners with four equivalent Mg(1)Ga12 cuboctahedra; corners with fourteen equivalent Ga(1)Mg4Ga8 cuboctahedra; edges with six equivalent Mg(1)Ga12 cuboctahedra; edges with twelve equivalent Ga(1)Mg4Ga8 cuboctahedra; faces with four equivalent Mg(1)Ga12 cuboctahedra; and faces with sixteen Ga(1,1)Mg4Ga8 cuboctahedra. There are a spread of Ga(1)-Ga(1) bond distances ranging from 2.86-3.00 Å. In the second Ga site, Ga(1) is bonded to four equivalent Mg(1) and eight equivalent Ga(1) atoms to form distorted GaMg4Ga8 cuboctahedra that share corners with four equivalent Mg(1)Ga12 cuboctahedra; corners with fourteen Ga(1,1)Mg4Ga8 cuboctahedra; edges with six equivalent Mg(1)Ga12 cuboctahedra; edges with twelve equivalent Ga(1)Mg4Ga8 cuboctahedra; faces with four equivalent Mg(1)Ga12 cuboctahedra; and faces with sixteen Ga(1,1)Mg4Ga8 cuboctahedra. There are a spread of Ga(1)-Ga(1) bond distances ranging from 2.86-3.00 Å.