MnSiO3 crystallizes in the triclinic P-1 space group. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(10), one O(13), one O(2), one O(4), and one O(8) atom to form MnO5 square pyramids that share  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Mn(2)O5 square pyramid,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 79°. In the second Mn site, Mn(2) is bonded to one O(1), one O(15), one O(7), one O(8), and one O(9) atom to form MnO5 square pyramids that share  a cornercorner with one Mn(1)O5 square pyramid,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(5)O4 tetrahedra, and  an edgeedge with one Mn(5)O6 octahedra. In the third Mn site, Mn(3) is bonded in a 4-coordinate geometry to one O(10), one O(13), one O(15), and one O(5) atom. In the fourth Mn site, Mn(4) is bonded in a 6-coordinate geometry to one O(12), one O(15), one O(3), one O(5), one O(6), and one O(7) atom. In the fifth Mn site, Mn(5) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(9) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(1)O5 square pyramids, corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Si(2)O4 tetrahedra, and edges with two equivalent Mn(2)O5 square pyramids. In the sixth Mn site, Mn(6) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(3), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(5)O6 octahedra, corners with two equivalent Mn(2)O5 square pyramids,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. In the second Si site, Si(2) is bonded to one O(1), one O(12), one O(2), and one O(3) atom to form SiO4 tetrahedra that share corners with two equivalent Mn(5)O6 octahedra,  a cornercorner with one Mn(1)O5 square pyramid,  a cornercorner with one Mn(2)O5 square pyramid,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-53°. In the third Si site, Si(3) is bonded to one O(10), one O(12), one O(13), and one O(14) atom to form SiO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(14), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O5 square pyramid,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(11), one O(15), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O5 square pyramid, corners with two equivalent Mn(2)O5 square pyramids,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mn(2), one Mn(5), one Mn(6), and one Si(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mn(1), one Mn(5), one Mn(6), and one Si(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Mn(4), one Mn(6), one Si(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Mn(1) and one Si(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Mn(3), one Mn(4), and one Si(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Mn(4), one Si(4), and one Si(5) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Mn(2), one Mn(4), and one Si(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one Si(5) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Mn(2), one Mn(5), and one Si(1) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(3), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(5) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Mn(4), one Si(2), and one Si(3) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(3), and one Si(3) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(4) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal pyramidal geometry to one Mn(2), one Mn(3), one Mn(4), and one Si(5) atom.
MnSiO3 crystallizes in the triclinic P-1 space group. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(10), one O(13), one O(2), one O(4), and one O(8) atom to form MnO5 square pyramids that share  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Mn(2)O5 square pyramid,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, and corners with two equivalent Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles are 79°. The Mn(1)-O(10) bond length is 2.22 Å. The Mn(1)-O(13) bond length is 2.22 Å. The Mn(1)-O(2) bond length is 2.29 Å. The Mn(1)-O(4) bond length is 2.03 Å. The Mn(1)-O(8) bond length is 2.24 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(15), one O(7), one O(8), and one O(9) atom to form MnO5 square pyramids that share  a cornercorner with one Mn(1)O5 square pyramid,  a cornercorner with one Si(2)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, corners with two equivalent Si(5)O4 tetrahedra, and  an edgeedge with one Mn(5)O6 octahedra. The Mn(2)-O(1) bond length is 2.24 Å. The Mn(2)-O(15) bond length is 2.17 Å. The Mn(2)-O(7) bond length is 2.12 Å. The Mn(2)-O(8) bond length is 2.19 Å. The Mn(2)-O(9) bond length is 2.17 Å. In the third Mn site, Mn(3) is bonded in a 4-coordinate geometry to one O(10), one O(13), one O(15), and one O(5) atom. The Mn(3)-O(10) bond length is 2.11 Å. The Mn(3)-O(13) bond length is 2.09 Å. The Mn(3)-O(15) bond length is 2.19 Å. The Mn(3)-O(5) bond length is 2.09 Å. In the fourth Mn site, Mn(4) is bonded in a 6-coordinate geometry to one O(12), one O(15), one O(3), one O(5), one O(6), and one O(7) atom. The Mn(4)-O(12) bond length is 2.34 Å. The Mn(4)-O(15) bond length is 2.51 Å. The Mn(4)-O(3) bond length is 2.65 Å. The Mn(4)-O(5) bond length is 2.04 Å. The Mn(4)-O(6) bond length is 2.21 Å. The Mn(4)-O(7) bond length is 2.17 Å. In the fifth Mn site, Mn(5) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(9) atoms to form distorted MnO6 octahedra that share corners with two equivalent Mn(1)O5 square pyramids, corners with two equivalent Si(1)O4 tetrahedra, corners with four equivalent Si(2)O4 tetrahedra, and edges with two equivalent Mn(2)O5 square pyramids. Both Mn(5)-O(1) bond lengths are 2.25 Å. Both Mn(5)-O(2) bond lengths are 2.70 Å. Both Mn(5)-O(9) bond lengths are 2.06 Å. In the sixth Mn site, Mn(6) is bonded in a 6-coordinate geometry to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms. Both Mn(6)-O(1) bond lengths are 2.30 Å. Both Mn(6)-O(2) bond lengths are 2.15 Å. Both Mn(6)-O(3) bond lengths are 2.35 Å. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(11), one O(3), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(5)O6 octahedra, corners with two equivalent Mn(2)O5 square pyramids,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. The Si(1)-O(11) bond length is 1.65 Å. The Si(1)-O(3) bond length is 1.70 Å. The Si(1)-O(7) bond length is 1.61 Å. The Si(1)-O(9) bond length is 1.63 Å. In the second Si site, Si(2) is bonded to one O(1), one O(12), one O(2), and one O(3) atom to form SiO4 tetrahedra that share corners with two equivalent Mn(5)O6 octahedra,  a cornercorner with one Mn(1)O5 square pyramid,  a cornercorner with one Mn(2)O5 square pyramid,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(3)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 35-53°. The Si(2)-O(1) bond length is 1.65 Å. The Si(2)-O(12) bond length is 1.63 Å. The Si(2)-O(2) bond length is 1.63 Å. The Si(2)-O(3) bond length is 1.69 Å. In the third Si site, Si(3) is bonded to one O(10), one O(12), one O(13), and one O(14) atom to form SiO4 tetrahedra that share corners with two equivalent Mn(1)O5 square pyramids,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The Si(3)-O(10) bond length is 1.62 Å. The Si(3)-O(12) bond length is 1.73 Å. The Si(3)-O(13) bond length is 1.64 Å. The Si(3)-O(14) bond length is 1.64 Å. In the fourth Si site, Si(4) is bonded to one O(14), one O(4), one O(5), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O5 square pyramid,  a cornercorner with one Si(3)O4 tetrahedra, and  a cornercorner with one Si(5)O4 tetrahedra. The Si(4)-O(14) bond length is 1.67 Å. The Si(4)-O(4) bond length is 1.58 Å. The Si(4)-O(5) bond length is 1.63 Å. The Si(4)-O(6) bond length is 1.71 Å. In the fifth Si site, Si(5) is bonded to one O(11), one O(15), one O(6), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O5 square pyramid, corners with two equivalent Mn(2)O5 square pyramids,  a cornercorner with one Si(1)O4 tetrahedra, and  a cornercorner with one Si(4)O4 tetrahedra. The Si(5)-O(11) bond length is 1.66 Å. The Si(5)-O(15) bond length is 1.64 Å. The Si(5)-O(6) bond length is 1.68 Å. The Si(5)-O(8) bond length is 1.62 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to one Mn(2), one Mn(5), one Mn(6), and one Si(2) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to one Mn(1), one Mn(5), one Mn(6), and one Si(2) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one Mn(4), one Mn(6), one Si(1), and one Si(2) atom. In the fourth O site, O(4) is bonded in a bent 150 degrees geometry to one Mn(1) and one Si(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal non-coplanar geometry to one Mn(3), one Mn(4), and one Si(4) atom. In the sixth O site, O(6) is bonded in a distorted trigonal non-coplanar geometry to one Mn(4), one Si(4), and one Si(5) atom. In the seventh O site, O(7) is bonded in a distorted trigonal non-coplanar geometry to one Mn(2), one Mn(4), and one Si(1) atom. In the eighth O site, O(8) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one Si(5) atom. In the ninth O site, O(9) is bonded in a distorted trigonal non-coplanar geometry to one Mn(2), one Mn(5), and one Si(1) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(3), and one Si(3) atom. In the eleventh O site, O(11) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(5) atom. In the twelfth O site, O(12) is bonded in a distorted trigonal planar geometry to one Mn(4), one Si(2), and one Si(3) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(3), and one Si(3) atom. In the fourteenth O site, O(14) is bonded in a bent 150 degrees geometry to one Si(3) and one Si(4) atom. In the fifteenth O site, O(15) is bonded in a distorted trigonal pyramidal geometry to one Mn(2), one Mn(3), one Mn(4), and one Si(5) atom.