MgIn3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Mg(1) is bonded to twelve equivalent In(1) atoms to form MgIn12 cuboctahedra that share corners with six equivalent Mg(1)In12 cuboctahedra, corners with twelve equivalent In(1)Mg4In8 cuboctahedra, edges with eighteen equivalent In(1)Mg4In8 cuboctahedra, faces with eight equivalent Mg(1)In12 cuboctahedra, and faces with twelve equivalent In(1)Mg4In8 cuboctahedra. In(1) is bonded to four equivalent Mg(1) and eight equivalent In(1) atoms to form distorted InMg4In8 cuboctahedra that share corners with four equivalent Mg(1)In12 cuboctahedra, corners with fourteen equivalent In(1)Mg4In8 cuboctahedra, edges with six equivalent Mg(1)In12 cuboctahedra, edges with twelve equivalent In(1)Mg4In8 cuboctahedra, faces with four equivalent Mg(1)In12 cuboctahedra, and faces with sixteen equivalent In(1)Mg4In8 cuboctahedra.
MgIn3 is beta Cu3Ti-like structured and crystallizes in the hexagonal P6_3/mmc space group. Mg(1) is bonded to twelve equivalent In(1) atoms to form MgIn12 cuboctahedra that share corners with six equivalent Mg(1)In12 cuboctahedra, corners with twelve equivalent In(1)Mg4In8 cuboctahedra, edges with eighteen equivalent In(1)Mg4In8 cuboctahedra, faces with eight equivalent Mg(1)In12 cuboctahedra, and faces with twelve equivalent In(1)Mg4In8 cuboctahedra. There are six shorter (3.23 Å) and six longer (3.30 Å) Mg(1)-In(1) bond lengths. In(1) is bonded to four equivalent Mg(1) and eight equivalent In(1) atoms to form distorted InMg4In8 cuboctahedra that share corners with four equivalent Mg(1)In12 cuboctahedra, corners with fourteen equivalent In(1)Mg4In8 cuboctahedra, edges with six equivalent Mg(1)In12 cuboctahedra, edges with twelve equivalent In(1)Mg4In8 cuboctahedra, faces with four equivalent Mg(1)In12 cuboctahedra, and faces with sixteen equivalent In(1)Mg4In8 cuboctahedra. There are a spread of In(1)-In(1) bond distances ranging from 3.21-3.31 Å.