Sr4Mn3BO3O7 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), two equivalent O(1), two equivalent O(7), and two equivalent O(8) atoms. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(6), two equivalent O(3), and two equivalent O(7) atoms to form MnO6 octahedra that share  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, and corners with two equivalent Mn(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 0-8°. In the second Mn site, Mn(2) is bonded to one O(5), two equivalent O(4), and two equivalent O(7) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, and corners with two equivalent Mn(2)O5 trigonal bipyramids. The corner-sharing octahedra are not tilted. In the third Mn site, Mn(3) is bonded to one O(1), one O(5), two equivalent O(2), and two equivalent O(8) atoms to form distorted MnO6 octahedra that share  a cornercorner with one Mn(1)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, and  a cornercorner with one Mn(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 0-2°. B(1) is bonded in a trigonal planar geometry to one O(6) and two equivalent O(8) atoms. There are eight inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sr(2), one Mn(1), and one Mn(3) atom to form a mixture of distorted edge, corner, and face-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 0-54°. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(3) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(1) atoms. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(2) atoms. In the fifth O site, O(5) is bonded to four equivalent Sr(1), one Mn(2), and one Mn(3) atom to form a mixture of distorted edge, corner, and face-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 0-57°. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to four equivalent Sr(1), one Mn(1), and one B(1) atom. In the seventh O site, O(7) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Mn(1), and one Mn(2) atom to form a mixture of distorted edge, corner, and face-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 0-57°. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent Sr(2), one Mn(3), and one B(1) atom.
Sr4Mn3BO3O7 crystallizes in the orthorhombic Amm2 space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), two equivalent O(5), two equivalent O(6), and two equivalent O(7) atoms. The Sr(1)-O(2) bond length is 2.80 Å. The Sr(1)-O(3) bond length is 2.65 Å. The Sr(1)-O(4) bond length is 3.00 Å. Both Sr(1)-O(5) bond lengths are 2.69 Å. Both Sr(1)-O(6) bond lengths are 2.79 Å. Both Sr(1)-O(7) bond lengths are 2.71 Å. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(2), one O(3), one O(4), two equivalent O(1), two equivalent O(7), and two equivalent O(8) atoms. The Sr(2)-O(2) bond length is 2.75 Å. The Sr(2)-O(3) bond length is 2.77 Å. The Sr(2)-O(4) bond length is 2.59 Å. Both Sr(2)-O(1) bond lengths are 2.62 Å. Both Sr(2)-O(7) bond lengths are 2.76 Å. Both Sr(2)-O(8) bond lengths are 2.63 Å. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(6), two equivalent O(3), and two equivalent O(7) atoms to form MnO6 octahedra that share  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, and corners with two equivalent Mn(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 0-8°. The Mn(1)-O(1) bond length is 2.13 Å. The Mn(1)-O(6) bond length is 2.38 Å. Both Mn(1)-O(3) bond lengths are 1.92 Å. Both Mn(1)-O(7) bond lengths are 1.95 Å. In the second Mn site, Mn(2) is bonded to one O(5), two equivalent O(4), and two equivalent O(7) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra, and corners with two equivalent Mn(2)O5 trigonal bipyramids. The corner-sharing octahedra are not tilted. The Mn(2)-O(5) bond length is 2.08 Å. Both Mn(2)-O(4) bond lengths are 1.96 Å. Both Mn(2)-O(7) bond lengths are 1.91 Å. In the third Mn site, Mn(3) is bonded to one O(1), one O(5), two equivalent O(2), and two equivalent O(8) atoms to form distorted MnO6 octahedra that share  a cornercorner with one Mn(1)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, and  a cornercorner with one Mn(2)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 0-2°. The Mn(3)-O(1) bond length is 1.91 Å. The Mn(3)-O(5) bond length is 1.94 Å. Both Mn(3)-O(2) bond lengths are 1.91 Å. Both Mn(3)-O(8) bond lengths are 2.67 Å. B(1) is bonded in a trigonal planar geometry to one O(6) and two equivalent O(8) atoms. The B(1)-O(6) bond length is 1.41 Å. Both B(1)-O(8) bond lengths are 1.39 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded to four equivalent Sr(2), one Mn(1), and one Mn(3) atom to form a mixture of distorted edge, corner, and face-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 0-54°. In the second O site, O(2) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(3) atoms. In the third O site, O(3) is bonded in a distorted linear geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(1) atoms. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent Sr(1), two equivalent Sr(2), and two equivalent Mn(2) atoms. In the fifth O site, O(5) is bonded to four equivalent Sr(1), one Mn(2), and one Mn(3) atom to form a mixture of distorted edge, corner, and face-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 0-57°. In the sixth O site, O(6) is bonded in a distorted single-bond geometry to four equivalent Sr(1), one Mn(1), and one B(1) atom. In the seventh O site, O(7) is bonded to two equivalent Sr(1), two equivalent Sr(2), one Mn(1), and one Mn(2) atom to form a mixture of distorted edge, corner, and face-sharing OSr4Mn2 octahedra. The corner-sharing octahedral tilt angles range from 0-57°. In the eighth O site, O(8) is bonded in a distorted single-bond geometry to two equivalent Sr(2), one Mn(3), and one B(1) atom.