ScHf3Ga12 is Uranium Silicide-derived structured and crystallizes in the tetragonal P4mm space group. Sc(1) is bonded to four equivalent Ga(2), four equivalent Ga(5), and four equivalent Ga(7) atoms to form ScGa12 cuboctahedra that share corners with four equivalent Sc(1)Ga12 cuboctahedra, corners with four equivalent Hf(3)Ga12 cuboctahedra, edges with four equivalent Hf(2)Ga12 cuboctahedra, edges with eight equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, edges with eight equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra,  a faceface with one Hf(3)Ga12 cuboctahedra, faces with four equivalent Sc(1)Ga12 cuboctahedra, faces with four equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, and faces with four equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra. There are three inequivalent Hf sites. In the first Hf site, Hf(1) is bonded to four equivalent Ga(1), four equivalent Ga(6), and four equivalent Ga(8) atoms to form HfGa12 cuboctahedra that share corners with four equivalent Hf(1)Ga12 cuboctahedra, corners with four equivalent Hf(2)Ga12 cuboctahedra, edges with four equivalent Hf(3)Ga12 cuboctahedra, edges with eight equivalent Ga(1)Hf4Ga8 cuboctahedra, edges with eight equivalent Ga(8)Hf4Ga8 cuboctahedra,  a faceface with one Hf(2)Ga12 cuboctahedra, faces with four equivalent Hf(1)Ga12 cuboctahedra, faces with four equivalent Ga(1)Hf4Ga8 cuboctahedra, and faces with four equivalent Ga(8)Hf4Ga8 cuboctahedra. In the second Hf site, Hf(2) is bonded to four equivalent Ga(1), four equivalent Ga(3), and four equivalent Ga(7) atoms to form HfGa12 cuboctahedra that share corners with four equivalent Hf(1)Ga12 cuboctahedra, corners with four equivalent Hf(2)Ga12 cuboctahedra, edges with four equivalent Sc(1)Ga12 cuboctahedra, edges with eight equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra, edges with eight equivalent Ga(1)Hf4Ga8 cuboctahedra,  a faceface with one Hf(1)Ga12 cuboctahedra, faces with four equivalent Hf(2)Ga12 cuboctahedra, faces with four equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra, and faces with four equivalent Ga(1)Hf4Ga8 cuboctahedra. In the third Hf site, Hf(3) is bonded to four equivalent Ga(2), four equivalent Ga(4), and four equivalent Ga(8) atoms to form HfGa12 cuboctahedra that share corners with four equivalent Sc(1)Ga12 cuboctahedra, corners with four equivalent Hf(3)Ga12 cuboctahedra, edges with four equivalent Hf(1)Ga12 cuboctahedra, edges with eight equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, edges with eight equivalent Ga(8)Hf4Ga8 cuboctahedra,  a faceface with one Sc(1)Ga12 cuboctahedra, faces with four equivalent Hf(3)Ga12 cuboctahedra, faces with four equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, and faces with four equivalent Ga(8)Hf4Ga8 cuboctahedra. There are eight inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to two equivalent Hf(1), two equivalent Hf(2), two equivalent Ga(3), two equivalent Ga(6), and four equivalent Ga(1) atoms to form distorted GaHf4Ga8 cuboctahedra that share corners with four equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra, corners with four equivalent Ga(1)Hf4Ga8 cuboctahedra, corners with four equivalent Ga(8)Hf4Ga8 cuboctahedra, edges with four equivalent Hf(1)Ga12 cuboctahedra, edges with four equivalent Hf(2)Ga12 cuboctahedra, edges with four equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra, edges with four equivalent Ga(8)Hf4Ga8 cuboctahedra,  a faceface with one Ga(7)Hf2Sc2Ga8 cuboctahedra,  a faceface with one Ga(8)Hf4Ga8 cuboctahedra, faces with two equivalent Hf(1)Ga12 cuboctahedra, faces with two equivalent Hf(2)Ga12 cuboctahedra, and faces with eight equivalent Ga(1)Hf4Ga8 cuboctahedra. In the second Ga site, Ga(2) is bonded to two equivalent Sc(1), two equivalent Hf(3), two equivalent Ga(4), two equivalent Ga(5), and four equivalent Ga(2) atoms to form distorted GaHf2Sc2Ga8 cuboctahedra that share corners with four equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, corners with four equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra, corners with four equivalent Ga(8)Hf4Ga8 cuboctahedra, edges with four equivalent Sc(1)Ga12 cuboctahedra, edges with four equivalent Hf(3)Ga12 cuboctahedra, edges with four equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra, edges with four equivalent Ga(8)Hf4Ga8 cuboctahedra,  a faceface with one Ga(7)Hf2Sc2Ga8 cuboctahedra,  a faceface with one Ga(8)Hf4Ga8 cuboctahedra, faces with two equivalent Sc(1)Ga12 cuboctahedra, faces with two equivalent Hf(3)Ga12 cuboctahedra, and faces with eight equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra. In the third Ga site, Ga(3) is bonded in a distorted rectangular see-saw-like geometry to four equivalent Hf(2), four equivalent Ga(1), and four equivalent Ga(7) atoms. In the fourth Ga site, Ga(4) is bonded in a distorted rectangular see-saw-like geometry to four equivalent Hf(3), four equivalent Ga(2), and four equivalent Ga(8) atoms. In the fifth Ga site, Ga(5) is bonded in a distorted rectangular see-saw-like geometry to four equivalent Sc(1), four equivalent Ga(2), and four equivalent Ga(7) atoms. In the sixth Ga site, Ga(6) is bonded in a distorted rectangular see-saw-like geometry to four equivalent Hf(1), four equivalent Ga(1), and four equivalent Ga(8) atoms. In the seventh Ga site, Ga(7) is bonded to two equivalent Sc(1), two equivalent Hf(2), two equivalent Ga(3), two equivalent Ga(5), and four equivalent Ga(7) atoms to form GaHf2Sc2Ga8 cuboctahedra that share corners with four equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, corners with four equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra, corners with four equivalent Ga(1)Hf4Ga8 cuboctahedra, edges with four equivalent Sc(1)Ga12 cuboctahedra, edges with four equivalent Hf(2)Ga12 cuboctahedra, edges with four equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, edges with four equivalent Ga(1)Hf4Ga8 cuboctahedra,  a faceface with one Ga(2)Hf2Sc2Ga8 cuboctahedra,  a faceface with one Ga(1)Hf4Ga8 cuboctahedra, faces with two equivalent Sc(1)Ga12 cuboctahedra, faces with two equivalent Hf(2)Ga12 cuboctahedra, and faces with eight equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra. In the eighth Ga site, Ga(8) is bonded to two equivalent Hf(1), two equivalent Hf(3), two equivalent Ga(4), two equivalent Ga(6), and four equivalent Ga(8) atoms to form distorted GaHf4Ga8 cuboctahedra that share corners with four equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, corners with four equivalent Ga(1)Hf4Ga8 cuboctahedra, corners with four equivalent Ga(8)Hf4Ga8 cuboctahedra, edges with four equivalent Hf(1)Ga12 cuboctahedra, edges with four equivalent Hf(3)Ga12 cuboctahedra, edges with four equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, edges with four equivalent Ga(1)Hf4Ga8 cuboctahedra,  a faceface with one Ga(2)Hf2Sc2Ga8 cuboctahedra,  a faceface with one Ga(1)Hf4Ga8 cuboctahedra, faces with two equivalent Hf(1)Ga12 cuboctahedra, faces with two equivalent Hf(3)Ga12 cuboctahedra, and faces with eight equivalent Ga(8)Hf4Ga8 cuboctahedra.
ScHf3Ga12 is Uranium Silicide-derived structured and crystallizes in the tetragonal P4mm space group. Sc(1) is bonded to four equivalent Ga(2), four equivalent Ga(5), and four equivalent Ga(7) atoms to form ScGa12 cuboctahedra that share corners with four equivalent Sc(1)Ga12 cuboctahedra, corners with four equivalent Hf(3)Ga12 cuboctahedra, edges with four equivalent Hf(2)Ga12 cuboctahedra, edges with eight equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, edges with eight equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra,  a faceface with one Hf(3)Ga12 cuboctahedra, faces with four equivalent Sc(1)Ga12 cuboctahedra, faces with four equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, and faces with four equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra. All Sc(1)-Ga(2) bond lengths are 2.89 Å. All Sc(1)-Ga(5) bond lengths are 2.81 Å. All Sc(1)-Ga(7) bond lengths are 3.05 Å. There are three inequivalent Hf sites. In the first Hf site, Hf(1) is bonded to four equivalent Ga(1), four equivalent Ga(6), and four equivalent Ga(8) atoms to form HfGa12 cuboctahedra that share corners with four equivalent Hf(1)Ga12 cuboctahedra, corners with four equivalent Hf(2)Ga12 cuboctahedra, edges with four equivalent Hf(3)Ga12 cuboctahedra, edges with eight equivalent Ga(1)Hf4Ga8 cuboctahedra, edges with eight equivalent Ga(8)Hf4Ga8 cuboctahedra,  a faceface with one Hf(2)Ga12 cuboctahedra, faces with four equivalent Hf(1)Ga12 cuboctahedra, faces with four equivalent Ga(1)Hf4Ga8 cuboctahedra, and faces with four equivalent Ga(8)Hf4Ga8 cuboctahedra. All Hf(1)-Ga(1) bond lengths are 2.89 Å. All Hf(1)-Ga(6) bond lengths are 2.81 Å. All Hf(1)-Ga(8) bond lengths are 3.05 Å. In the second Hf site, Hf(2) is bonded to four equivalent Ga(1), four equivalent Ga(3), and four equivalent Ga(7) atoms to form HfGa12 cuboctahedra that share corners with four equivalent Hf(1)Ga12 cuboctahedra, corners with four equivalent Hf(2)Ga12 cuboctahedra, edges with four equivalent Sc(1)Ga12 cuboctahedra, edges with eight equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra, edges with eight equivalent Ga(1)Hf4Ga8 cuboctahedra,  a faceface with one Hf(1)Ga12 cuboctahedra, faces with four equivalent Hf(2)Ga12 cuboctahedra, faces with four equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra, and faces with four equivalent Ga(1)Hf4Ga8 cuboctahedra. All Hf(2)-Ga(1) bond lengths are 2.87 Å. All Hf(2)-Ga(3) bond lengths are 2.82 Å. All Hf(2)-Ga(7) bond lengths are 3.06 Å. In the third Hf site, Hf(3) is bonded to four equivalent Ga(2), four equivalent Ga(4), and four equivalent Ga(8) atoms to form HfGa12 cuboctahedra that share corners with four equivalent Sc(1)Ga12 cuboctahedra, corners with four equivalent Hf(3)Ga12 cuboctahedra, edges with four equivalent Hf(1)Ga12 cuboctahedra, edges with eight equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, edges with eight equivalent Ga(8)Hf4Ga8 cuboctahedra,  a faceface with one Sc(1)Ga12 cuboctahedra, faces with four equivalent Hf(3)Ga12 cuboctahedra, faces with four equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, and faces with four equivalent Ga(8)Hf4Ga8 cuboctahedra. All Hf(3)-Ga(2) bond lengths are 2.90 Å. All Hf(3)-Ga(4) bond lengths are 2.81 Å. All Hf(3)-Ga(8) bond lengths are 3.03 Å. There are eight inequivalent Ga sites. In the first Ga site, Ga(1) is bonded to two equivalent Hf(1), two equivalent Hf(2), two equivalent Ga(3), two equivalent Ga(6), and four equivalent Ga(1) atoms to form distorted GaHf4Ga8 cuboctahedra that share corners with four equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra, corners with four equivalent Ga(1)Hf4Ga8 cuboctahedra, corners with four equivalent Ga(8)Hf4Ga8 cuboctahedra, edges with four equivalent Hf(1)Ga12 cuboctahedra, edges with four equivalent Hf(2)Ga12 cuboctahedra, edges with four equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra, edges with four equivalent Ga(8)Hf4Ga8 cuboctahedra,  a faceface with one Ga(7)Hf2Sc2Ga8 cuboctahedra,  a faceface with one Ga(8)Hf4Ga8 cuboctahedra, faces with two equivalent Hf(1)Ga12 cuboctahedra, faces with two equivalent Hf(2)Ga12 cuboctahedra, and faces with eight equivalent Ga(1)Hf4Ga8 cuboctahedra. Both Ga(1)-Ga(3) bond lengths are 2.99 Å. Both Ga(1)-Ga(6) bond lengths are 2.96 Å. All Ga(1)-Ga(1) bond lengths are 2.81 Å. In the second Ga site, Ga(2) is bonded to two equivalent Sc(1), two equivalent Hf(3), two equivalent Ga(4), two equivalent Ga(5), and four equivalent Ga(2) atoms to form distorted GaHf2Sc2Ga8 cuboctahedra that share corners with four equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, corners with four equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra, corners with four equivalent Ga(8)Hf4Ga8 cuboctahedra, edges with four equivalent Sc(1)Ga12 cuboctahedra, edges with four equivalent Hf(3)Ga12 cuboctahedra, edges with four equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra, edges with four equivalent Ga(8)Hf4Ga8 cuboctahedra,  a faceface with one Ga(7)Hf2Sc2Ga8 cuboctahedra,  a faceface with one Ga(8)Hf4Ga8 cuboctahedra, faces with two equivalent Sc(1)Ga12 cuboctahedra, faces with two equivalent Hf(3)Ga12 cuboctahedra, and faces with eight equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra. Both Ga(2)-Ga(4) bond lengths are 2.94 Å. Both Ga(2)-Ga(5) bond lengths are 2.95 Å. All Ga(2)-Ga(2) bond lengths are 2.81 Å. In the third Ga site, Ga(3) is bonded in a distorted rectangular see-saw-like geometry to four equivalent Hf(2), four equivalent Ga(1), and four equivalent Ga(7) atoms. All Ga(3)-Ga(7) bond lengths are 2.94 Å. In the fourth Ga site, Ga(4) is bonded in a distorted rectangular see-saw-like geometry to four equivalent Hf(3), four equivalent Ga(2), and four equivalent Ga(8) atoms. All Ga(4)-Ga(8) bond lengths are 2.99 Å. In the fifth Ga site, Ga(5) is bonded in a distorted rectangular see-saw-like geometry to four equivalent Sc(1), four equivalent Ga(2), and four equivalent Ga(7) atoms. All Ga(5)-Ga(7) bond lengths are 2.98 Å. In the sixth Ga site, Ga(6) is bonded in a distorted rectangular see-saw-like geometry to four equivalent Hf(1), four equivalent Ga(1), and four equivalent Ga(8) atoms. All Ga(6)-Ga(8) bond lengths are 2.97 Å. In the seventh Ga site, Ga(7) is bonded to two equivalent Sc(1), two equivalent Hf(2), two equivalent Ga(3), two equivalent Ga(5), and four equivalent Ga(7) atoms to form GaHf2Sc2Ga8 cuboctahedra that share corners with four equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, corners with four equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra, corners with four equivalent Ga(1)Hf4Ga8 cuboctahedra, edges with four equivalent Sc(1)Ga12 cuboctahedra, edges with four equivalent Hf(2)Ga12 cuboctahedra, edges with four equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, edges with four equivalent Ga(1)Hf4Ga8 cuboctahedra,  a faceface with one Ga(2)Hf2Sc2Ga8 cuboctahedra,  a faceface with one Ga(1)Hf4Ga8 cuboctahedra, faces with two equivalent Sc(1)Ga12 cuboctahedra, faces with two equivalent Hf(2)Ga12 cuboctahedra, and faces with eight equivalent Ga(7)Hf2Sc2Ga8 cuboctahedra. All Ga(7)-Ga(7) bond lengths are 2.81 Å. In the eighth Ga site, Ga(8) is bonded to two equivalent Hf(1), two equivalent Hf(3), two equivalent Ga(4), two equivalent Ga(6), and four equivalent Ga(8) atoms to form distorted GaHf4Ga8 cuboctahedra that share corners with four equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, corners with four equivalent Ga(1)Hf4Ga8 cuboctahedra, corners with four equivalent Ga(8)Hf4Ga8 cuboctahedra, edges with four equivalent Hf(1)Ga12 cuboctahedra, edges with four equivalent Hf(3)Ga12 cuboctahedra, edges with four equivalent Ga(2)Hf2Sc2Ga8 cuboctahedra, edges with four equivalent Ga(1)Hf4Ga8 cuboctahedra,  a faceface with one Ga(2)Hf2Sc2Ga8 cuboctahedra,  a faceface with one Ga(1)Hf4Ga8 cuboctahedra, faces with two equivalent Hf(1)Ga12 cuboctahedra, faces with two equivalent Hf(3)Ga12 cuboctahedra, and faces with eight equivalent Ga(8)Hf4Ga8 cuboctahedra. All Ga(8)-Ga(8) bond lengths are 2.81 Å.