Ba8Eu7Cl34 crystallizes in the tetragonal I4/m space group. Ba(1) is bonded in a 10-coordinate geometry to one Cl(1), one Cl(3), one Cl(6), two equivalent Cl(2), two equivalent Cl(5), and three equivalent Cl(4) atoms. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a body-centered cubic geometry to eight equivalent Cl(2) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to four equivalent Cl(4) and four equivalent Cl(5) atoms. In the third Eu site, Eu(3) is bonded in a 8-coordinate geometry to two equivalent Cl(1), two equivalent Cl(2), two equivalent Cl(5), and two equivalent Cl(6) atoms. There are six inequivalent Cl sites. In the first Cl site, Cl(2) is bonded to two equivalent Ba(1), one Eu(1), and one Eu(3) atom to form ClBa2Eu2 tetrahedra that share corners with two equivalent Cl(1)Ba2Eu2 tetrahedra, corners with two equivalent Cl(3)Ba4 tetrahedra, corners with four equivalent Cl(2)Ba2Eu2 tetrahedra, corners with four equivalent Cl(4)Ba3Eu tetrahedra, corners with four equivalent Cl(5)Ba2Eu2 trigonal pyramids,  an edgeedge with one Cl(1)Ba2Eu2 tetrahedra,  an edgeedge with one Cl(4)Ba3Eu tetrahedra, edges with three equivalent Cl(2)Ba2Eu2 tetrahedra, and  an edgeedge with one Cl(5)Ba2Eu2 trigonal pyramid. In the second Cl site, Cl(3) is bonded to four equivalent Ba(1) atoms to form ClBa4 tetrahedra that share corners with four equivalent Cl(4)Ba3Eu tetrahedra, corners with eight equivalent Cl(2)Ba2Eu2 tetrahedra, corners with eight equivalent Cl(5)Ba2Eu2 trigonal pyramids, edges with two equivalent Cl(1)Ba2Eu2 tetrahedra, and edges with four equivalent Cl(4)Ba3Eu tetrahedra. In the third Cl site, Cl(4) is bonded to three equivalent Ba(1) and one Eu(2) atom to form ClBa3Eu tetrahedra that share  a cornercorner with one Cl(3)Ba4 tetrahedra, corners with three equivalent Cl(1)Ba2Eu2 tetrahedra, corners with three equivalent Cl(4)Ba3Eu tetrahedra, corners with four equivalent Cl(2)Ba2Eu2 tetrahedra, corners with six equivalent Cl(5)Ba2Eu2 trigonal pyramids,  an edgeedge with one Cl(2)Ba2Eu2 tetrahedra,  an edgeedge with one Cl(3)Ba4 tetrahedra, edges with three equivalent Cl(4)Ba3Eu tetrahedra, and edges with two equivalent Cl(5)Ba2Eu2 trigonal pyramids. In the fourth Cl site, Cl(5) is bonded to two equivalent Ba(1), one Eu(2), and one Eu(3) atom to form distorted ClBa2Eu2 trigonal pyramids that share corners with two equivalent Cl(1)Ba2Eu2 tetrahedra, corners with two equivalent Cl(3)Ba4 tetrahedra, corners with four equivalent Cl(2)Ba2Eu2 tetrahedra, corners with six equivalent Cl(4)Ba3Eu tetrahedra, corners with two equivalent Cl(5)Ba2Eu2 trigonal pyramids,  an edgeedge with one Cl(1)Ba2Eu2 tetrahedra,  an edgeedge with one Cl(2)Ba2Eu2 tetrahedra, edges with two equivalent Cl(4)Ba3Eu tetrahedra, and edges with two equivalent Cl(5)Ba2Eu2 trigonal pyramids. In the fifth Cl site, Cl(6) is bonded in a distorted bent 150 degrees geometry to two equivalent Ba(1) and two equivalent Eu(3) atoms. In the sixth Cl site, Cl(1) is bonded to two equivalent Ba(1) and two equivalent Eu(3) atoms to form ClBa2Eu2 tetrahedra that share corners with four equivalent Cl(2)Ba2Eu2 tetrahedra, corners with six equivalent Cl(4)Ba3Eu tetrahedra, corners with four equivalent Cl(5)Ba2Eu2 trigonal pyramids,  an edgeedge with one Cl(1)Ba2Eu2 tetrahedra,  an edgeedge with one Cl(3)Ba4 tetrahedra, edges with two equivalent Cl(2)Ba2Eu2 tetrahedra, and edges with two equivalent Cl(5)Ba2Eu2 trigonal pyramids.
Ba8Eu7Cl34 crystallizes in the tetragonal I4/m space group. Ba(1) is bonded in a 10-coordinate geometry to one Cl(1), one Cl(3), one Cl(6), two equivalent Cl(2), two equivalent Cl(5), and three equivalent Cl(4) atoms. The Ba(1)-Cl(1) bond length is 3.16 Å. The Ba(1)-Cl(3) bond length is 3.28 Å. The Ba(1)-Cl(6) bond length is 3.66 Å. There is one shorter (3.33 Å) and one longer (3.34 Å) Ba(1)-Cl(2) bond length. There is one shorter (3.41 Å) and one longer (3.48 Å) Ba(1)-Cl(5) bond length. There are a spread of Ba(1)-Cl(4) bond distances ranging from 3.12-3.43 Å. There are three inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a body-centered cubic geometry to eight equivalent Cl(2) atoms. All Eu(1)-Cl(2) bond lengths are 2.97 Å. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to four equivalent Cl(4) and four equivalent Cl(5) atoms. All Eu(2)-Cl(4) bond lengths are 2.91 Å. All Eu(2)-Cl(5) bond lengths are 2.94 Å. In the third Eu site, Eu(3) is bonded in a 8-coordinate geometry to two equivalent Cl(1), two equivalent Cl(2), two equivalent Cl(5), and two equivalent Cl(6) atoms. Both Eu(3)-Cl(1) bond lengths are 2.92 Å. Both Eu(3)-Cl(2) bond lengths are 2.96 Å. Both Eu(3)-Cl(5) bond lengths are 2.94 Å. There is one shorter (2.79 Å) and one longer (2.86 Å) Eu(3)-Cl(6) bond length. There are six inequivalent Cl sites. In the first Cl site, Cl(2) is bonded to two equivalent Ba(1), one Eu(1), and one Eu(3) atom to form ClBa2Eu2 tetrahedra that share corners with two equivalent Cl(1)Ba2Eu2 tetrahedra, corners with two equivalent Cl(3)Ba4 tetrahedra, corners with four equivalent Cl(2)Ba2Eu2 tetrahedra, corners with four equivalent Cl(4)Ba3Eu tetrahedra, corners with four equivalent Cl(5)Ba2Eu2 trigonal pyramids,  an edgeedge with one Cl(1)Ba2Eu2 tetrahedra,  an edgeedge with one Cl(4)Ba3Eu tetrahedra, edges with three equivalent Cl(2)Ba2Eu2 tetrahedra, and  an edgeedge with one Cl(5)Ba2Eu2 trigonal pyramid. In the second Cl site, Cl(3) is bonded to four equivalent Ba(1) atoms to form ClBa4 tetrahedra that share corners with four equivalent Cl(4)Ba3Eu tetrahedra, corners with eight equivalent Cl(2)Ba2Eu2 tetrahedra, corners with eight equivalent Cl(5)Ba2Eu2 trigonal pyramids, edges with two equivalent Cl(1)Ba2Eu2 tetrahedra, and edges with four equivalent Cl(4)Ba3Eu tetrahedra. In the third Cl site, Cl(4) is bonded to three equivalent Ba(1) and one Eu(2) atom to form ClBa3Eu tetrahedra that share  a cornercorner with one Cl(3)Ba4 tetrahedra, corners with three equivalent Cl(1)Ba2Eu2 tetrahedra, corners with three equivalent Cl(4)Ba3Eu tetrahedra, corners with four equivalent Cl(2)Ba2Eu2 tetrahedra, corners with six equivalent Cl(5)Ba2Eu2 trigonal pyramids,  an edgeedge with one Cl(2)Ba2Eu2 tetrahedra,  an edgeedge with one Cl(3)Ba4 tetrahedra, edges with three equivalent Cl(4)Ba3Eu tetrahedra, and edges with two equivalent Cl(5)Ba2Eu2 trigonal pyramids. In the fourth Cl site, Cl(5) is bonded to two equivalent Ba(1), one Eu(2), and one Eu(3) atom to form distorted ClBa2Eu2 trigonal pyramids that share corners with two equivalent Cl(1)Ba2Eu2 tetrahedra, corners with two equivalent Cl(3)Ba4 tetrahedra, corners with four equivalent Cl(2)Ba2Eu2 tetrahedra, corners with six equivalent Cl(4)Ba3Eu tetrahedra, corners with two equivalent Cl(5)Ba2Eu2 trigonal pyramids,  an edgeedge with one Cl(1)Ba2Eu2 tetrahedra,  an edgeedge with one Cl(2)Ba2Eu2 tetrahedra, edges with two equivalent Cl(4)Ba3Eu tetrahedra, and edges with two equivalent Cl(5)Ba2Eu2 trigonal pyramids. In the fifth Cl site, Cl(6) is bonded in a distorted bent 150 degrees geometry to two equivalent Ba(1) and two equivalent Eu(3) atoms. In the sixth Cl site, Cl(1) is bonded to two equivalent Ba(1) and two equivalent Eu(3) atoms to form ClBa2Eu2 tetrahedra that share corners with four equivalent Cl(2)Ba2Eu2 tetrahedra, corners with six equivalent Cl(4)Ba3Eu tetrahedra, corners with four equivalent Cl(5)Ba2Eu2 trigonal pyramids,  an edgeedge with one Cl(1)Ba2Eu2 tetrahedra,  an edgeedge with one Cl(3)Ba4 tetrahedra, edges with two equivalent Cl(2)Ba2Eu2 tetrahedra, and edges with two equivalent Cl(5)Ba2Eu2 trigonal pyramids.