MnSiO3 crystallizes in the triclinic P-1 space group. There are five inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(10), one O(12), one O(2), and two equivalent O(6) atoms to form MnO6 octahedra that share  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Si(5)O4 tetrahedra, corners with three equivalent Si(4)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra, and edges with two equivalent Mn(5)O6 octahedra. In the second Mn site, Mn(2) is bonded in a 4-coordinate geometry to one O(12), one O(2), one O(5), and one O(8) atom. In the third Mn site, Mn(3) is bonded to one O(1), one O(12), one O(5), one O(7), and two equivalent O(4) atoms to form MnO6 octahedra that share  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra, and  an edgeedge with one Mn(5)O6 octahedra. In the fourth Mn site, Mn(4) is bonded in a 5-coordinate geometry to one O(14), one O(15), one O(4), one O(7), and one O(8) atom. In the fifth Mn site, Mn(5) is bonded to one O(1), one O(10), one O(15), one O(3), one O(6), and one O(7) atom to form distorted MnO6 octahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra,  an edgeedge with one Mn(3)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(14), one O(3), one O(5), and one O(7) atom to form SiO4 tetrahedra that share corners with two equivalent Mn(3)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  an edgeedge with one Mn(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-63°. In the second Si site, Si(2) is bonded to one O(14), one O(15), one O(4), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(5)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-67°. In the third Si site, Si(3) is bonded to one O(1), one O(13), one O(3), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-70°. In the fourth Si site, Si(4) is bonded to one O(11), one O(13), one O(2), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(5)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-67°. In the fifth Si site, Si(5) is bonded to one O(10), one O(11), one O(12), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-63°. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded to one Mn(1), one Mn(3), one Mn(5), and one Si(3) atom to form a mixture of distorted corner and edge-sharing OMn3Si tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one Mn(2), and one Si(4) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mn(5), one Si(1), and one Si(3) atom. In the fourth O site, O(4) is bonded to one Mn(4), two equivalent Mn(3), and one Si(2) atom to form a mixture of distorted corner and edge-sharing OMn3Si tetrahedra. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mn(2), one Mn(3), and one Si(1) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Mn(5), two equivalent Mn(1), and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Mn(3), one Mn(4), one Mn(5), and one Si(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(4), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Si(2) and one Si(5) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(5), and one Si(5) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Si(4) and one Si(5) atom. In the twelfth O site, O(12) is bonded to one Mn(1), one Mn(2), one Mn(3), and one Si(5) atom to form a mixture of distorted corner and edge-sharing OMn3Si trigonal pyramids. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(4) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Mn(4), one Si(1), and one Si(2) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Mn(4), one Mn(5), and one Si(2) atom.
MnSiO3 crystallizes in the triclinic P-1 space group. There are five inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(10), one O(12), one O(2), and two equivalent O(6) atoms to form MnO6 octahedra that share  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Si(5)O4 tetrahedra, corners with three equivalent Si(4)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra, and edges with two equivalent Mn(5)O6 octahedra. The Mn(1)-O(1) bond length is 2.36 Å. The Mn(1)-O(10) bond length is 2.15 Å. The Mn(1)-O(12) bond length is 2.22 Å. The Mn(1)-O(2) bond length is 2.14 Å. There is one shorter (2.24 Å) and one longer (2.31 Å) Mn(1)-O(6) bond length. In the second Mn site, Mn(2) is bonded in a 4-coordinate geometry to one O(12), one O(2), one O(5), and one O(8) atom. The Mn(2)-O(12) bond length is 2.16 Å. The Mn(2)-O(2) bond length is 2.07 Å. The Mn(2)-O(5) bond length is 2.12 Å. The Mn(2)-O(8) bond length is 2.09 Å. In the third Mn site, Mn(3) is bonded to one O(1), one O(12), one O(5), one O(7), and two equivalent O(4) atoms to form MnO6 octahedra that share  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra,  an edgeedge with one Mn(1)O6 octahedra,  an edgeedge with one Mn(3)O6 octahedra, and  an edgeedge with one Mn(5)O6 octahedra. The Mn(3)-O(1) bond length is 2.25 Å. The Mn(3)-O(12) bond length is 2.27 Å. The Mn(3)-O(5) bond length is 2.14 Å. The Mn(3)-O(7) bond length is 2.12 Å. There is one shorter (2.17 Å) and one longer (2.32 Å) Mn(3)-O(4) bond length. In the fourth Mn site, Mn(4) is bonded in a 5-coordinate geometry to one O(14), one O(15), one O(4), one O(7), and one O(8) atom. The Mn(4)-O(14) bond length is 2.36 Å. The Mn(4)-O(15) bond length is 2.05 Å. The Mn(4)-O(4) bond length is 2.12 Å. The Mn(4)-O(7) bond length is 2.25 Å. The Mn(4)-O(8) bond length is 2.01 Å. In the fifth Mn site, Mn(5) is bonded to one O(1), one O(10), one O(15), one O(3), one O(6), and one O(7) atom to form distorted MnO6 octahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with two equivalent Si(3)O4 tetrahedra,  an edgeedge with one Mn(3)O6 octahedra, edges with two equivalent Mn(1)O6 octahedra, and  an edgeedge with one Si(1)O4 tetrahedra. The Mn(5)-O(1) bond length is 2.12 Å. The Mn(5)-O(10) bond length is 2.10 Å. The Mn(5)-O(15) bond length is 2.21 Å. The Mn(5)-O(3) bond length is 2.26 Å. The Mn(5)-O(6) bond length is 2.22 Å. The Mn(5)-O(7) bond length is 2.39 Å. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(14), one O(3), one O(5), and one O(7) atom to form SiO4 tetrahedra that share corners with two equivalent Mn(3)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  an edgeedge with one Mn(5)O6 octahedra. The corner-sharing octahedral tilt angles range from 11-63°. The Si(1)-O(14) bond length is 1.66 Å. The Si(1)-O(3) bond length is 1.66 Å. The Si(1)-O(5) bond length is 1.60 Å. The Si(1)-O(7) bond length is 1.61 Å. In the second Si site, Si(2) is bonded to one O(14), one O(15), one O(4), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(5)O6 octahedra, corners with two equivalent Mn(3)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-67°. The Si(2)-O(14) bond length is 1.64 Å. The Si(2)-O(15) bond length is 1.60 Å. The Si(2)-O(4) bond length is 1.63 Å. The Si(2)-O(9) bond length is 1.65 Å. In the third Si site, Si(3) is bonded to one O(1), one O(13), one O(3), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(3)O6 octahedra, corners with two equivalent Mn(5)O6 octahedra,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-70°. The Si(3)-O(1) bond length is 1.62 Å. The Si(3)-O(13) bond length is 1.62 Å. The Si(3)-O(3) bond length is 1.64 Å. The Si(3)-O(8) bond length is 1.61 Å. In the fourth Si site, Si(4) is bonded to one O(11), one O(13), one O(2), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(5)O6 octahedra, corners with three equivalent Mn(1)O6 octahedra,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 45-67°. The Si(4)-O(11) bond length is 1.65 Å. The Si(4)-O(13) bond length is 1.62 Å. The Si(4)-O(2) bond length is 1.60 Å. The Si(4)-O(6) bond length is 1.63 Å. In the fifth Si site, Si(5) is bonded to one O(10), one O(11), one O(12), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Mn(5)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 47-63°. The Si(5)-O(10) bond length is 1.60 Å. The Si(5)-O(11) bond length is 1.63 Å. The Si(5)-O(12) bond length is 1.63 Å. The Si(5)-O(9) bond length is 1.66 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded to one Mn(1), one Mn(3), one Mn(5), and one Si(3) atom to form a mixture of distorted corner and edge-sharing OMn3Si tetrahedra. In the second O site, O(2) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one Mn(2), and one Si(4) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Mn(5), one Si(1), and one Si(3) atom. In the fourth O site, O(4) is bonded to one Mn(4), two equivalent Mn(3), and one Si(2) atom to form a mixture of distorted corner and edge-sharing OMn3Si tetrahedra. In the fifth O site, O(5) is bonded in a 3-coordinate geometry to one Mn(2), one Mn(3), and one Si(1) atom. In the sixth O site, O(6) is bonded in a distorted rectangular see-saw-like geometry to one Mn(5), two equivalent Mn(1), and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted rectangular see-saw-like geometry to one Mn(3), one Mn(4), one Mn(5), and one Si(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(4), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 120 degrees geometry to one Si(2) and one Si(5) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(5), and one Si(5) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Si(4) and one Si(5) atom. In the twelfth O site, O(12) is bonded to one Mn(1), one Mn(2), one Mn(3), and one Si(5) atom to form a mixture of distorted corner and edge-sharing OMn3Si trigonal pyramids. In the thirteenth O site, O(13) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(4) atom. In the fourteenth O site, O(14) is bonded in a 3-coordinate geometry to one Mn(4), one Si(1), and one Si(2) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal planar geometry to one Mn(4), one Mn(5), and one Si(2) atom.