Mn5(SiO5)2 is beta indium sulfide-derived structured and crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, corners with four equivalent Mn(2)O6 octahedra, corners with three equivalent Si(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-71°. In the second Mn site, Mn(2) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Mn(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-68°. In the third Mn site, Mn(3) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 54-71°. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(2)O6 octahedra, and  an edgeedge with one Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-64°. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Mn(1), one Mn(2), one Mn(3), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mn(1), two equivalent Mn(2), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mn(3), two equivalent Mn(1), and one Si(1) atom. In the fourth O site, O(4) is bonded to one Mn(1), one Mn(2), one Mn(3), and one Si(1) atom to form distorted corner-sharing OMn3Si tetrahedra. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mn(1) and two equivalent Mn(2) atoms.
Mn5(SiO5)2 is beta indium sulfide-derived structured and crystallizes in the monoclinic P2_1/c space group. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(2), one O(4), one O(5), and two equivalent O(3) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(1)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra, corners with four equivalent Mn(2)O6 octahedra, corners with three equivalent Si(1)O4 tetrahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-71°. The Mn(1)-O(1) bond length is 2.11 Å. The Mn(1)-O(2) bond length is 2.34 Å. The Mn(1)-O(4) bond length is 2.30 Å. The Mn(1)-O(5) bond length is 2.09 Å. There is one shorter (2.17 Å) and one longer (2.42 Å) Mn(1)-O(3) bond length. In the second Mn site, Mn(2) is bonded to one O(1), one O(4), two equivalent O(2), and two equivalent O(5) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(2)O6 octahedra, corners with four equivalent Mn(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(2)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 49-68°. The Mn(2)-O(1) bond length is 2.35 Å. The Mn(2)-O(4) bond length is 2.10 Å. There is one shorter (2.11 Å) and one longer (2.19 Å) Mn(2)-O(2) bond length. There is one shorter (1.92 Å) and one longer (1.93 Å) Mn(2)-O(5) bond length. In the third Mn site, Mn(3) is bonded to two equivalent O(1), two equivalent O(3), and two equivalent O(4) atoms to form MnO6 octahedra that share corners with four equivalent Mn(1)O6 octahedra, corners with two equivalent Si(1)O4 tetrahedra, edges with two equivalent Mn(1)O6 octahedra, edges with two equivalent Mn(2)O6 octahedra, and edges with two equivalent Si(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 54-71°. Both Mn(3)-O(1) bond lengths are 2.15 Å. Both Mn(3)-O(3) bond lengths are 2.30 Å. Both Mn(3)-O(4) bond lengths are 2.30 Å. Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(2)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(2)O6 octahedra, and  an edgeedge with one Mn(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-64°. The Si(1)-O(1) bond length is 1.65 Å. The Si(1)-O(2) bond length is 1.67 Å. The Si(1)-O(3) bond length is 1.64 Å. The Si(1)-O(4) bond length is 1.65 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a distorted rectangular see-saw-like geometry to one Mn(1), one Mn(2), one Mn(3), and one Si(1) atom. In the second O site, O(2) is bonded in a distorted rectangular see-saw-like geometry to one Mn(1), two equivalent Mn(2), and one Si(1) atom. In the third O site, O(3) is bonded in a distorted rectangular see-saw-like geometry to one Mn(3), two equivalent Mn(1), and one Si(1) atom. In the fourth O site, O(4) is bonded to one Mn(1), one Mn(2), one Mn(3), and one Si(1) atom to form distorted corner-sharing OMn3Si tetrahedra. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mn(1) and two equivalent Mn(2) atoms.