Tb2MnGa6 crystallizes in the cubic Fm-3m space group. Tb(1) is bonded to twelve equivalent Ga(1) atoms to form TbGa12 cuboctahedra that share corners with twelve equivalent Tb(1)Ga12 cuboctahedra, faces with six equivalent Tb(1)Ga12 cuboctahedra, and faces with four equivalent Mn(1)Ga6 octahedra. Mn(1) is bonded to six equivalent Ga(1) atoms to form MnGa6 octahedra that share faces with eight equivalent Tb(1)Ga12 cuboctahedra. Ga(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1), one Mn(1), and four equivalent Ga(1) atoms.
Tb2MnGa6 crystallizes in the cubic Fm-3m space group. Tb(1) is bonded to twelve equivalent Ga(1) atoms to form TbGa12 cuboctahedra that share corners with twelve equivalent Tb(1)Ga12 cuboctahedra, faces with six equivalent Tb(1)Ga12 cuboctahedra, and faces with four equivalent Mn(1)Ga6 octahedra. All Tb(1)-Ga(1) bond lengths are 3.10 Å. Mn(1) is bonded to six equivalent Ga(1) atoms to form MnGa6 octahedra that share faces with eight equivalent Tb(1)Ga12 cuboctahedra. All Mn(1)-Ga(1) bond lengths are 2.47 Å. Ga(1) is bonded in a 9-coordinate geometry to four equivalent Tb(1), one Mn(1), and four equivalent Ga(1) atoms. All Ga(1)-Ga(1) bond lengths are 2.68 Å.