Al10Ce2Mn7 crystallizes in the monoclinic Cm space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 19-coordinate geometry to one Mn(2), one Mn(3), two equivalent Mn(1), two equivalent Mn(5), four equivalent Mn(4), one Al(1), two equivalent Al(3), two equivalent Al(4), two equivalent Al(5), and two equivalent Al(6) atoms. In the second Ce site, Ce(2) is bonded in a 13-coordinate geometry to one Mn(5), two equivalent Mn(3), two equivalent Mn(4), one Al(2), two equivalent Al(3), two equivalent Al(4), two equivalent Al(5), and four equivalent Al(6) atoms. There are five inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 10-coordinate geometry to one Ce(1), one Mn(3), one Mn(4), one Mn(5), one Al(1), one Al(2), one Al(3), one Al(5), one Al(6), and two equivalent Al(4) atoms. In the second Mn site, Mn(2) is bonded in a 10-coordinate geometry to one Ce(1), two equivalent Mn(4), one Al(1), one Al(2), two equivalent Al(3), two equivalent Al(5), and two equivalent Al(6) atoms. In the third Mn site, Mn(3) is bonded in a 12-coordinate geometry to one Ce(1), two equivalent Ce(2), two equivalent Mn(1), two equivalent Mn(4), one Al(2), two equivalent Al(3), and two equivalent Al(4) atoms. In the fourth Mn site, Mn(4) is bonded to one Ce(2), two equivalent Ce(1), one Mn(1), one Mn(2), one Mn(3), one Al(1), one Al(4), one Al(5), one Al(6), and two equivalent Al(3) atoms to form distorted MnCe3Mn3Al6 cuboctahedra that share corners with two equivalent Mn(4)Ce3Mn3Al6 cuboctahedra, corners with five equivalent Al(6)Ce3Mn4Al5 cuboctahedra,  an edgeedge with one Al(6)Ce3Mn4Al5 cuboctahedra, edges with two equivalent Mn(5)Ce3Mn2Al7 cuboctahedra, edges with two equivalent Mn(4)Ce3Mn3Al6 cuboctahedra, faces with two equivalent Mn(5)Ce3Mn2Al7 cuboctahedra, faces with two equivalent Mn(4)Ce3Mn3Al6 cuboctahedra, and faces with two equivalent Al(6)Ce3Mn4Al5 cuboctahedra. In the fifth Mn site, Mn(5) is bonded to one Ce(2), two equivalent Ce(1), two equivalent Mn(1), one Al(1), two equivalent Al(4), two equivalent Al(5), and two equivalent Al(6) atoms to form distorted MnCe3Mn2Al7 cuboctahedra that share corners with two equivalent Mn(5)Ce3Mn2Al7 cuboctahedra, corners with six equivalent Al(6)Ce3Mn4Al5 cuboctahedra, edges with four equivalent Mn(4)Ce3Mn3Al6 cuboctahedra, faces with two equivalent Al(6)Ce3Mn4Al5 cuboctahedra, and faces with four equivalent Mn(4)Ce3Mn3Al6 cuboctahedra. There are six inequivalent Al sites. In the first Al site, Al(1) is bonded in a 8-coordinate geometry to one Ce(1), one Mn(2), one Mn(5), two equivalent Mn(1), two equivalent Mn(4), one Al(2), two equivalent Al(3), and two equivalent Al(5) atoms. In the second Al site, Al(2) is bonded in a 8-coordinate geometry to one Ce(2), one Mn(2), one Mn(3), two equivalent Mn(1), one Al(1), two equivalent Al(3), two equivalent Al(5), and two equivalent Al(6) atoms. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to one Ce(1), one Ce(2), one Mn(1), one Mn(2), one Mn(3), two equivalent Mn(4), one Al(1), one Al(2), one Al(3), one Al(4), and one Al(6) atom. In the fourth Al site, Al(4) is bonded in a 10-coordinate geometry to one Ce(1), one Ce(2), one Mn(3), one Mn(4), one Mn(5), two equivalent Mn(1), one Al(3), one Al(5), and one Al(6) atom. In the fifth Al site, Al(5) is bonded in a 12-coordinate geometry to one Ce(1), one Ce(2), one Mn(1), one Mn(2), one Mn(4), one Mn(5), one Al(1), one Al(2), one Al(4), one Al(5), and two equivalent Al(6) atoms. In the sixth Al site, Al(6) is bonded to one Ce(1), two equivalent Ce(2), one Mn(1), one Mn(2), one Mn(4), one Mn(5), one Al(2), one Al(3), one Al(4), and two equivalent Al(5) atoms to form distorted AlCe3Mn4Al5 cuboctahedra that share corners with two equivalent Al(6)Ce3Mn4Al5 cuboctahedra, corners with three equivalent Mn(5)Ce3Mn2Al7 cuboctahedra, corners with five equivalent Mn(4)Ce3Mn3Al6 cuboctahedra,  an edgeedge with one Mn(4)Ce3Mn3Al6 cuboctahedra, edges with two equivalent Al(6)Ce3Mn4Al5 cuboctahedra,  a faceface with one Mn(5)Ce3Mn2Al7 cuboctahedra, faces with two equivalent Mn(4)Ce3Mn3Al6 cuboctahedra, and faces with two equivalent Al(6)Ce3Mn4Al5 cuboctahedra.
Al10Ce2Mn7 crystallizes in the monoclinic Cm space group. There are two inequivalent Ce sites. In the first Ce site, Ce(1) is bonded in a 19-coordinate geometry to one Mn(2), one Mn(3), two equivalent Mn(1), two equivalent Mn(5), four equivalent Mn(4), one Al(1), two equivalent Al(3), two equivalent Al(4), two equivalent Al(5), and two equivalent Al(6) atoms. The Ce(1)-Mn(2) bond length is 3.39 Å. The Ce(1)-Mn(3) bond length is 3.18 Å. Both Ce(1)-Mn(1) bond lengths are 3.39 Å. There is one shorter (3.27 Å) and one longer (3.43 Å) Ce(1)-Mn(5) bond length. There are two shorter (3.27 Å) and two longer (3.43 Å) Ce(1)-Mn(4) bond lengths. The Ce(1)-Al(1) bond length is 3.03 Å. Both Ce(1)-Al(3) bond lengths are 3.13 Å. Both Ce(1)-Al(4) bond lengths are 3.02 Å. Both Ce(1)-Al(5) bond lengths are 3.11 Å. Both Ce(1)-Al(6) bond lengths are 3.19 Å. In the second Ce site, Ce(2) is bonded in a 13-coordinate geometry to one Mn(5), two equivalent Mn(3), two equivalent Mn(4), one Al(2), two equivalent Al(3), two equivalent Al(4), two equivalent Al(5), and four equivalent Al(6) atoms. The Ce(2)-Mn(5) bond length is 3.18 Å. There is one shorter (3.21 Å) and one longer (3.49 Å) Ce(2)-Mn(3) bond length. Both Ce(2)-Mn(4) bond lengths are 3.17 Å. The Ce(2)-Al(2) bond length is 3.10 Å. Both Ce(2)-Al(3) bond lengths are 3.10 Å. Both Ce(2)-Al(4) bond lengths are 3.14 Å. Both Ce(2)-Al(5) bond lengths are 3.18 Å. There are two shorter (3.29 Å) and two longer (3.41 Å) Ce(2)-Al(6) bond lengths. There are five inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 10-coordinate geometry to one Ce(1), one Mn(3), one Mn(4), one Mn(5), one Al(1), one Al(2), one Al(3), one Al(5), one Al(6), and two equivalent Al(4) atoms. The Mn(1)-Mn(3) bond length is 2.61 Å. The Mn(1)-Mn(4) bond length is 2.49 Å. The Mn(1)-Mn(5) bond length is 2.50 Å. The Mn(1)-Al(1) bond length is 2.61 Å. The Mn(1)-Al(2) bond length is 2.69 Å. The Mn(1)-Al(3) bond length is 2.52 Å. The Mn(1)-Al(5) bond length is 2.54 Å. The Mn(1)-Al(6) bond length is 2.59 Å. There is one shorter (2.53 Å) and one longer (2.59 Å) Mn(1)-Al(4) bond length. In the second Mn site, Mn(2) is bonded in a 10-coordinate geometry to one Ce(1), two equivalent Mn(4), one Al(1), one Al(2), two equivalent Al(3), two equivalent Al(5), and two equivalent Al(6) atoms. Both Mn(2)-Mn(4) bond lengths are 2.50 Å. The Mn(2)-Al(1) bond length is 2.63 Å. The Mn(2)-Al(2) bond length is 2.74 Å. Both Mn(2)-Al(3) bond lengths are 2.59 Å. Both Mn(2)-Al(5) bond lengths are 2.54 Å. Both Mn(2)-Al(6) bond lengths are 2.60 Å. In the third Mn site, Mn(3) is bonded in a 12-coordinate geometry to one Ce(1), two equivalent Ce(2), two equivalent Mn(1), two equivalent Mn(4), one Al(2), two equivalent Al(3), and two equivalent Al(4) atoms. Both Mn(3)-Mn(4) bond lengths are 2.64 Å. The Mn(3)-Al(2) bond length is 2.61 Å. Both Mn(3)-Al(3) bond lengths are 2.60 Å. Both Mn(3)-Al(4) bond lengths are 2.61 Å. In the fourth Mn site, Mn(4) is bonded to one Ce(2), two equivalent Ce(1), one Mn(1), one Mn(2), one Mn(3), one Al(1), one Al(4), one Al(5), one Al(6), and two equivalent Al(3) atoms to form distorted MnCe3Mn3Al6 cuboctahedra that share corners with two equivalent Mn(4)Ce3Mn3Al6 cuboctahedra, corners with five equivalent Al(6)Ce3Mn4Al5 cuboctahedra,  an edgeedge with one Al(6)Ce3Mn4Al5 cuboctahedra, edges with two equivalent Mn(5)Ce3Mn2Al7 cuboctahedra, edges with two equivalent Mn(4)Ce3Mn3Al6 cuboctahedra, faces with two equivalent Mn(5)Ce3Mn2Al7 cuboctahedra, faces with two equivalent Mn(4)Ce3Mn3Al6 cuboctahedra, and faces with two equivalent Al(6)Ce3Mn4Al5 cuboctahedra. The Mn(4)-Al(1) bond length is 2.63 Å. The Mn(4)-Al(4) bond length is 2.62 Å. The Mn(4)-Al(5) bond length is 2.70 Å. The Mn(4)-Al(6) bond length is 2.61 Å. There is one shorter (2.66 Å) and one longer (2.68 Å) Mn(4)-Al(3) bond length. In the fifth Mn site, Mn(5) is bonded to one Ce(2), two equivalent Ce(1), two equivalent Mn(1), one Al(1), two equivalent Al(4), two equivalent Al(5), and two equivalent Al(6) atoms to form distorted MnCe3Mn2Al7 cuboctahedra that share corners with two equivalent Mn(5)Ce3Mn2Al7 cuboctahedra, corners with six equivalent Al(6)Ce3Mn4Al5 cuboctahedra, edges with four equivalent Mn(4)Ce3Mn3Al6 cuboctahedra, faces with two equivalent Al(6)Ce3Mn4Al5 cuboctahedra, and faces with four equivalent Mn(4)Ce3Mn3Al6 cuboctahedra. The Mn(5)-Al(1) bond length is 2.63 Å. Both Mn(5)-Al(4) bond lengths are 2.67 Å. Both Mn(5)-Al(5) bond lengths are 2.64 Å. Both Mn(5)-Al(6) bond lengths are 2.62 Å. There are six inequivalent Al sites. In the first Al site, Al(1) is bonded in a 8-coordinate geometry to one Ce(1), one Mn(2), one Mn(5), two equivalent Mn(1), two equivalent Mn(4), one Al(2), two equivalent Al(3), and two equivalent Al(5) atoms. The Al(1)-Al(2) bond length is 2.88 Å. Both Al(1)-Al(3) bond lengths are 3.01 Å. Both Al(1)-Al(5) bond lengths are 3.00 Å. In the second Al site, Al(2) is bonded in a 8-coordinate geometry to one Ce(2), one Mn(2), one Mn(3), two equivalent Mn(1), one Al(1), two equivalent Al(3), two equivalent Al(5), and two equivalent Al(6) atoms. Both Al(2)-Al(3) bond lengths are 2.97 Å. Both Al(2)-Al(5) bond lengths are 3.08 Å. Both Al(2)-Al(6) bond lengths are 2.73 Å. In the third Al site, Al(3) is bonded in a 12-coordinate geometry to one Ce(1), one Ce(2), one Mn(1), one Mn(2), one Mn(3), two equivalent Mn(4), one Al(1), one Al(2), one Al(3), one Al(4), and one Al(6) atom. The Al(3)-Al(3) bond length is 2.68 Å. The Al(3)-Al(4) bond length is 2.66 Å. The Al(3)-Al(6) bond length is 2.72 Å. In the fourth Al site, Al(4) is bonded in a 10-coordinate geometry to one Ce(1), one Ce(2), one Mn(3), one Mn(4), one Mn(5), two equivalent Mn(1), one Al(3), one Al(5), and one Al(6) atom. The Al(4)-Al(5) bond length is 2.76 Å. The Al(4)-Al(6) bond length is 2.77 Å. In the fifth Al site, Al(5) is bonded in a 12-coordinate geometry to one Ce(1), one Ce(2), one Mn(1), one Mn(2), one Mn(4), one Mn(5), one Al(1), one Al(2), one Al(4), one Al(5), and two equivalent Al(6) atoms. The Al(5)-Al(5) bond length is 2.62 Å. There is one shorter (2.67 Å) and one longer (2.69 Å) Al(5)-Al(6) bond length. In the sixth Al site, Al(6) is bonded to one Ce(1), two equivalent Ce(2), one Mn(1), one Mn(2), one Mn(4), one Mn(5), one Al(2), one Al(3), one Al(4), and two equivalent Al(5) atoms to form distorted AlCe3Mn4Al5 cuboctahedra that share corners with two equivalent Al(6)Ce3Mn4Al5 cuboctahedra, corners with three equivalent Mn(5)Ce3Mn2Al7 cuboctahedra, corners with five equivalent Mn(4)Ce3Mn3Al6 cuboctahedra,  an edgeedge with one Mn(4)Ce3Mn3Al6 cuboctahedra, edges with two equivalent Al(6)Ce3Mn4Al5 cuboctahedra,  a faceface with one Mn(5)Ce3Mn2Al7 cuboctahedra, faces with two equivalent Mn(4)Ce3Mn3Al6 cuboctahedra, and faces with two equivalent Al(6)Ce3Mn4Al5 cuboctahedra.