Ba3La2Cl12 crystallizes in the triclinic P-1 space group. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one Cl(1), one Cl(11), one Cl(12), one Cl(3), one Cl(4), one Cl(9), and two equivalent Cl(5) atoms. In the second Ba site, Ba(2) is bonded in a 7-coordinate geometry to one Cl(1), one Cl(10), one Cl(12), one Cl(5), one Cl(6), one Cl(7), and one Cl(9) atom. In the third Ba site, Ba(3) is bonded in a 7-coordinate geometry to one Cl(1), one Cl(11), one Cl(2), one Cl(4), one Cl(6), and two equivalent Cl(9) atoms. There are two inequivalent La sites. In the first La site, La(1) is bonded in an octahedral geometry to one Cl(2), one Cl(3), one Cl(4), one Cl(6), one Cl(7), and one Cl(8) atom. In the second La site, La(2) is bonded in a 7-coordinate geometry to one Cl(10), one Cl(11), one Cl(12), one Cl(3), one Cl(5), one Cl(7), and one Cl(8) atom. There are twelve inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a trigonal non-coplanar geometry to one Ba(1), one Ba(2), and one Ba(3) atom. In the second Cl site, Cl(2) is bonded in a 2-coordinate geometry to one Ba(3) and one La(1) atom. In the third Cl site, Cl(3) is bonded in a distorted trigonal planar geometry to one Ba(1), one La(1), and one La(2) atom. In the fourth Cl site, Cl(4) is bonded in a distorted trigonal planar geometry to one Ba(1), one Ba(3), and one La(1) atom. In the fifth Cl site, Cl(5) is bonded to one Ba(2), two equivalent Ba(1), and one La(2) atom to form distorted ClBa3La tetrahedra that share corners with three equivalent Cl(9)Ba4 tetrahedra and  an edgeedge with one Cl(5)Ba3La tetrahedra. In the sixth Cl site, Cl(6) is bonded in a trigonal non-coplanar geometry to one Ba(2), one Ba(3), and one La(1) atom. In the seventh Cl site, Cl(7) is bonded in a 3-coordinate geometry to one Ba(2), one La(1), and one La(2) atom. In the eighth Cl site, Cl(8) is bonded in a bent 150 degrees geometry to one La(1) and one La(2) atom. In the ninth Cl site, Cl(9) is bonded to one Ba(1), one Ba(2), and two equivalent Ba(3) atoms to form ClBa4 tetrahedra that share corners with three equivalent Cl(5)Ba3La tetrahedra and  an edgeedge with one Cl(9)Ba4 tetrahedra. In the tenth Cl site, Cl(10) is bonded in a distorted water-like geometry to one Ba(2) and one La(2) atom. In the eleventh Cl site, Cl(11) is bonded in a distorted trigonal planar geometry to one Ba(1), one Ba(3), and one La(2) atom. In the twelfth Cl site, Cl(12) is bonded in a distorted trigonal planar geometry to one Ba(1), one Ba(2), and one La(2) atom.
Ba3La2Cl12 crystallizes in the triclinic P-1 space group. There are three inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to one Cl(1), one Cl(11), one Cl(12), one Cl(3), one Cl(4), one Cl(9), and two equivalent Cl(5) atoms. The Ba(1)-Cl(1) bond length is 3.05 Å. The Ba(1)-Cl(11) bond length is 3.41 Å. The Ba(1)-Cl(12) bond length is 3.13 Å. The Ba(1)-Cl(3) bond length is 3.43 Å. The Ba(1)-Cl(4) bond length is 3.31 Å. The Ba(1)-Cl(9) bond length is 3.29 Å. There is one shorter (3.30 Å) and one longer (3.51 Å) Ba(1)-Cl(5) bond length. In the second Ba site, Ba(2) is bonded in a 7-coordinate geometry to one Cl(1), one Cl(10), one Cl(12), one Cl(5), one Cl(6), one Cl(7), and one Cl(9) atom. The Ba(2)-Cl(1) bond length is 3.12 Å. The Ba(2)-Cl(10) bond length is 3.27 Å. The Ba(2)-Cl(12) bond length is 3.15 Å. The Ba(2)-Cl(5) bond length is 3.47 Å. The Ba(2)-Cl(6) bond length is 3.31 Å. The Ba(2)-Cl(7) bond length is 3.18 Å. The Ba(2)-Cl(9) bond length is 3.38 Å. In the third Ba site, Ba(3) is bonded in a 7-coordinate geometry to one Cl(1), one Cl(11), one Cl(2), one Cl(4), one Cl(6), and two equivalent Cl(9) atoms. The Ba(3)-Cl(1) bond length is 3.04 Å. The Ba(3)-Cl(11) bond length is 3.38 Å. The Ba(3)-Cl(2) bond length is 3.44 Å. The Ba(3)-Cl(4) bond length is 3.16 Å. The Ba(3)-Cl(6) bond length is 3.25 Å. There is one shorter (3.09 Å) and one longer (3.21 Å) Ba(3)-Cl(9) bond length. There are two inequivalent La sites. In the first La site, La(1) is bonded in an octahedral geometry to one Cl(2), one Cl(3), one Cl(4), one Cl(6), one Cl(7), and one Cl(8) atom. The La(1)-Cl(2) bond length is 2.74 Å. The La(1)-Cl(3) bond length is 2.84 Å. The La(1)-Cl(4) bond length is 2.76 Å. The La(1)-Cl(6) bond length is 2.80 Å. The La(1)-Cl(7) bond length is 2.81 Å. The La(1)-Cl(8) bond length is 2.81 Å. In the second La site, La(2) is bonded in a 7-coordinate geometry to one Cl(10), one Cl(11), one Cl(12), one Cl(3), one Cl(5), one Cl(7), and one Cl(8) atom. The La(2)-Cl(10) bond length is 2.71 Å. The La(2)-Cl(11) bond length is 2.77 Å. The La(2)-Cl(12) bond length is 2.80 Å. The La(2)-Cl(3) bond length is 2.94 Å. The La(2)-Cl(5) bond length is 2.84 Å. The La(2)-Cl(7) bond length is 3.31 Å. The La(2)-Cl(8) bond length is 2.86 Å. There are twelve inequivalent Cl sites. In the first Cl site, Cl(1) is bonded in a trigonal non-coplanar geometry to one Ba(1), one Ba(2), and one Ba(3) atom. In the second Cl site, Cl(2) is bonded in a 2-coordinate geometry to one Ba(3) and one La(1) atom. In the third Cl site, Cl(3) is bonded in a distorted trigonal planar geometry to one Ba(1), one La(1), and one La(2) atom. In the fourth Cl site, Cl(4) is bonded in a distorted trigonal planar geometry to one Ba(1), one Ba(3), and one La(1) atom. In the fifth Cl site, Cl(5) is bonded to one Ba(2), two equivalent Ba(1), and one La(2) atom to form distorted ClBa3La tetrahedra that share corners with three equivalent Cl(9)Ba4 tetrahedra and  an edgeedge with one Cl(5)Ba3La tetrahedra. In the sixth Cl site, Cl(6) is bonded in a trigonal non-coplanar geometry to one Ba(2), one Ba(3), and one La(1) atom. In the seventh Cl site, Cl(7) is bonded in a 3-coordinate geometry to one Ba(2), one La(1), and one La(2) atom. In the eighth Cl site, Cl(8) is bonded in a bent 150 degrees geometry to one La(1) and one La(2) atom. In the ninth Cl site, Cl(9) is bonded to one Ba(1), one Ba(2), and two equivalent Ba(3) atoms to form ClBa4 tetrahedra that share corners with three equivalent Cl(5)Ba3La tetrahedra and  an edgeedge with one Cl(9)Ba4 tetrahedra. In the tenth Cl site, Cl(10) is bonded in a distorted water-like geometry to one Ba(2) and one La(2) atom. In the eleventh Cl site, Cl(11) is bonded in a distorted trigonal planar geometry to one Ba(1), one Ba(3), and one La(2) atom. In the twelfth Cl site, Cl(12) is bonded in a distorted trigonal planar geometry to one Ba(1), one Ba(2), and one La(2) atom.