CeLa(MnSi)4 crystallizes in the tetragonal P4/mmm space group. Ce(1) is bonded in a 16-coordinate geometry to eight equivalent Mn(1) and eight equivalent Si(1) atoms. La(1) is bonded in a 16-coordinate geometry to eight equivalent Mn(1) and eight equivalent Si(2) atoms. Mn(1) is bonded to two equivalent Ce(1), two equivalent La(1), two equivalent Si(1), and two equivalent Si(2) atoms to form a mixture of corner, face, and edge-sharing MnLa2Ce2Si4 tetrahedra. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Ce(1), four equivalent Mn(1), and one Si(1) atom. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent La(1), four equivalent Mn(1), and one Si(2) atom.
CeLa(MnSi)4 crystallizes in the tetragonal P4/mmm space group. Ce(1) is bonded in a 16-coordinate geometry to eight equivalent Mn(1) and eight equivalent Si(1) atoms. All Ce(1)-Mn(1) bond lengths are 3.25 Å. All Ce(1)-Si(1) bond lengths are 3.09 Å. La(1) is bonded in a 16-coordinate geometry to eight equivalent Mn(1) and eight equivalent Si(2) atoms. All La(1)-Mn(1) bond lengths are 3.34 Å. All La(1)-Si(2) bond lengths are 3.12 Å. Mn(1) is bonded to two equivalent Ce(1), two equivalent La(1), two equivalent Si(1), and two equivalent Si(2) atoms to form a mixture of corner, face, and edge-sharing MnLa2Ce2Si4 tetrahedra. Both Mn(1)-Si(1) bond lengths are 2.38 Å. Both Mn(1)-Si(2) bond lengths are 2.39 Å. There are two inequivalent Si sites. In the first Si site, Si(1) is bonded in a 9-coordinate geometry to four equivalent Ce(1), four equivalent Mn(1), and one Si(1) atom. The Si(1)-Si(1) bond length is 2.55 Å. In the second Si site, Si(2) is bonded in a 9-coordinate geometry to four equivalent La(1), four equivalent Mn(1), and one Si(2) atom. The Si(2)-Si(2) bond length is 2.72 Å.