YMn2Al(BO4)2 crystallizes in the monoclinic Pc space group. Y(1) is bonded in a 7-coordinate geometry to one O(3), one O(5), one O(7), two equivalent O(1), and two equivalent O(4) atoms. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(3), two equivalent O(5), and two equivalent O(8) atoms to form MnO6 octahedra that share corners with two equivalent Al(1)O5 trigonal bipyramids and edges with two equivalent Mn(1)O6 octahedra. In the second Mn site, Mn(2) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(6), and two equivalent O(7) atoms. Al(1) is bonded to one O(2), one O(4), one O(6), and two equivalent O(3) atoms to form AlO5 trigonal bipyramids that share corners with two equivalent Mn(1)O6 octahedra and corners with two equivalent Al(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 66-67°. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(5), and one O(7) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(2), one O(6), and one O(8) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Y(1), one Mn(1), and one B(1) atom to form distorted OY2MnB tetrahedra that share corners with two equivalent O(4)Y2MnAl tetrahedra, corners with two equivalent O(1)Y2MnB tetrahedra, corners with three equivalent O(3)YMnAl2 tetrahedra, corners with three equivalent O(7)YMn2B trigonal pyramids, and  an edgeedge with one O(4)Y2MnAl tetrahedra. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mn(2), one Al(1), and one B(2) atom. In the third O site, O(3) is bonded to one Y(1), one Mn(1), and two equivalent Al(1) atoms to form OYMnAl2 tetrahedra that share corners with two equivalent O(3)YMnAl2 tetrahedra, corners with three equivalent O(1)Y2MnB tetrahedra,  a cornercorner with one O(7)YMn2B trigonal pyramid, and edges with two equivalent O(4)Y2MnAl tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Y(1), one Mn(2), and one Al(1) atom to form OY2MnAl tetrahedra that share corners with two equivalent O(4)Y2MnAl tetrahedra, corners with two equivalent O(1)Y2MnB tetrahedra,  an edgeedge with one O(1)Y2MnB tetrahedra, edges with two equivalent O(3)YMnAl2 tetrahedra, and edges with two equivalent O(7)YMn2B trigonal pyramids. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Y(1), two equivalent Mn(1), and one B(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Mn(2), one Al(1), and one B(2) atom. In the seventh O site, O(7) is bonded to one Y(1), two equivalent Mn(2), and one B(1) atom to form distorted OYMn2B trigonal pyramids that share  a cornercorner with one O(3)YMnAl2 tetrahedra, corners with three equivalent O(1)Y2MnB tetrahedra, corners with two equivalent O(7)YMn2B trigonal pyramids, and edges with two equivalent O(4)Y2MnAl tetrahedra. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Mn(1) and one B(2) atom.
YMn2Al(BO4)2 crystallizes in the monoclinic Pc space group. Y(1) is bonded in a 7-coordinate geometry to one O(3), one O(5), one O(7), two equivalent O(1), and two equivalent O(4) atoms. The Y(1)-O(3) bond length is 2.35 Å. The Y(1)-O(5) bond length is 2.33 Å. The Y(1)-O(7) bond length is 2.40 Å. There is one shorter (2.40 Å) and one longer (2.41 Å) Y(1)-O(1) bond length. Both Y(1)-O(4) bond lengths are 2.20 Å. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(3), two equivalent O(5), and two equivalent O(8) atoms to form MnO6 octahedra that share corners with two equivalent Al(1)O5 trigonal bipyramids and edges with two equivalent Mn(1)O6 octahedra. The Mn(1)-O(1) bond length is 2.24 Å. The Mn(1)-O(3) bond length is 2.15 Å. There is one shorter (2.25 Å) and one longer (2.37 Å) Mn(1)-O(5) bond length. There is one shorter (2.13 Å) and one longer (2.15 Å) Mn(1)-O(8) bond length. In the second Mn site, Mn(2) is bonded in a 6-coordinate geometry to one O(2), one O(4), two equivalent O(6), and two equivalent O(7) atoms. The Mn(2)-O(2) bond length is 2.20 Å. The Mn(2)-O(4) bond length is 2.19 Å. There is one shorter (2.34 Å) and one longer (2.48 Å) Mn(2)-O(6) bond length. There is one shorter (2.26 Å) and one longer (2.27 Å) Mn(2)-O(7) bond length. Al(1) is bonded to one O(2), one O(4), one O(6), and two equivalent O(3) atoms to form AlO5 trigonal bipyramids that share corners with two equivalent Mn(1)O6 octahedra and corners with two equivalent Al(1)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 66-67°. The Al(1)-O(2) bond length is 1.86 Å. The Al(1)-O(4) bond length is 1.88 Å. The Al(1)-O(6) bond length is 1.93 Å. There is one shorter (1.89 Å) and one longer (1.99 Å) Al(1)-O(3) bond length. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(5), and one O(7) atom. The B(1)-O(1) bond length is 1.38 Å. The B(1)-O(5) bond length is 1.39 Å. The B(1)-O(7) bond length is 1.39 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(2), one O(6), and one O(8) atom. The B(2)-O(2) bond length is 1.39 Å. The B(2)-O(6) bond length is 1.41 Å. The B(2)-O(8) bond length is 1.37 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded to two equivalent Y(1), one Mn(1), and one B(1) atom to form distorted OY2MnB tetrahedra that share corners with two equivalent O(4)Y2MnAl tetrahedra, corners with two equivalent O(1)Y2MnB tetrahedra, corners with three equivalent O(3)YMnAl2 tetrahedra, corners with three equivalent O(7)YMn2B trigonal pyramids, and  an edgeedge with one O(4)Y2MnAl tetrahedra. In the second O site, O(2) is bonded in a 3-coordinate geometry to one Mn(2), one Al(1), and one B(2) atom. In the third O site, O(3) is bonded to one Y(1), one Mn(1), and two equivalent Al(1) atoms to form OYMnAl2 tetrahedra that share corners with two equivalent O(3)YMnAl2 tetrahedra, corners with three equivalent O(1)Y2MnB tetrahedra,  a cornercorner with one O(7)YMn2B trigonal pyramid, and edges with two equivalent O(4)Y2MnAl tetrahedra. In the fourth O site, O(4) is bonded to two equivalent Y(1), one Mn(2), and one Al(1) atom to form OY2MnAl tetrahedra that share corners with two equivalent O(4)Y2MnAl tetrahedra, corners with two equivalent O(1)Y2MnB tetrahedra,  an edgeedge with one O(1)Y2MnB tetrahedra, edges with two equivalent O(3)YMnAl2 tetrahedra, and edges with two equivalent O(7)YMn2B trigonal pyramids. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one Y(1), two equivalent Mn(1), and one B(1) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to two equivalent Mn(2), one Al(1), and one B(2) atom. In the seventh O site, O(7) is bonded to one Y(1), two equivalent Mn(2), and one B(1) atom to form distorted OYMn2B trigonal pyramids that share  a cornercorner with one O(3)YMnAl2 tetrahedra, corners with three equivalent O(1)Y2MnB tetrahedra, corners with two equivalent O(7)YMn2B trigonal pyramids, and edges with two equivalent O(4)Y2MnAl tetrahedra. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to two equivalent Mn(1) and one B(2) atom.