MnSiO3 crystallizes in the triclinic P-1 space group. There are six inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 5-coordinate geometry to one O(1), one O(10), one O(2), one O(4), and one O(8) atom. In the second Mn site, Mn(2) is bonded to one O(1), one O(3), one O(7), one O(8), and one O(9) atom to form MnO5 square pyramids that share  a cornercorner with one Si(5)O4 tetrahedra,  an edgeedge with one Mn(5)O6 octahedra, and  an edgeedge with one Mn(6)O6 octahedra. In the third Mn site, Mn(3) is bonded to one O(10), one O(15), one O(5), and two equivalent O(13) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with three equivalent Si(3)O4 tetrahedra, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. In the fourth Mn site, Mn(4) is bonded in a 4-coordinate geometry to one O(12), one O(14), one O(5), and one O(6) 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 Si(5)O4 tetrahedra, edges with two equivalent Mn(6)O6 octahedra, and edges with two equivalent Mn(2)O5 square pyramids. In the sixth Mn site, Mn(6) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted MnO6 octahedra that share corners with two equivalent Si(5)O4 tetrahedra, edges with two equivalent Mn(5)O6 octahedra, and edges with two equivalent Mn(2)O5 square pyramids. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded in a trigonal non-coplanar geometry to one O(11), one O(7), and one O(9) atom. In the second Si site, Si(2) is bonded in a trigonal non-coplanar geometry to one O(11), one O(3), and one O(6) atom. 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 three equivalent Mn(3)O5 trigonal bipyramids and  an edgeedge with one Si(4)O4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(12), one O(14), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(3)O5 trigonal bipyramid and  an edgeedge with one Si(3)O4 tetrahedra. In the fifth Si site, Si(5) is bonded to one O(11), one O(15), one O(2), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Mn(6)O6 octahedra,  a cornercorner with one Mn(2)O5 square pyramid, and  a cornercorner with one Mn(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 47-64°. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Mn(1), one Mn(2), one Mn(5), and one Mn(6) 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(5) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(6), and one Si(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Mn(1) and one Si(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(4), and one Si(4) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Mn(4) and one Si(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Mn(2) and one Si(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one Mn(2), and one Si(5) atom. In the ninth O site, O(9) is bonded in a 3-coordinate 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 trigonal planar geometry to one Si(1), one Si(2), and one Si(5) atom. In the twelfth O site, O(12) is bonded in a distorted T-shaped geometry to one Mn(4), one Si(3), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to two equivalent Mn(3) and one Si(3) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal non-coplanar geometry to one Mn(4), one Si(3), and one Si(4) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one Mn(3) 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 in a 5-coordinate geometry to one O(1), one O(10), one O(2), one O(4), and one O(8) atom. The Mn(1)-O(1) bond length is 2.45 Å. The Mn(1)-O(10) bond length is 2.51 Å. The Mn(1)-O(2) bond length is 2.31 Å. The Mn(1)-O(4) bond length is 1.94 Å. The Mn(1)-O(8) bond length is 2.15 Å. In the second Mn site, Mn(2) is bonded to one O(1), one O(3), one O(7), one O(8), and one O(9) atom to form MnO5 square pyramids that share  a cornercorner with one Si(5)O4 tetrahedra,  an edgeedge with one Mn(5)O6 octahedra, and  an edgeedge with one Mn(6)O6 octahedra. The Mn(2)-O(1) bond length is 1.94 Å. The Mn(2)-O(3) bond length is 1.91 Å. The Mn(2)-O(7) bond length is 1.89 Å. The Mn(2)-O(8) bond length is 1.95 Å. The Mn(2)-O(9) bond length is 2.29 Å. In the third Mn site, Mn(3) is bonded to one O(10), one O(15), one O(5), and two equivalent O(13) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Si(4)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra, corners with three equivalent Si(3)O4 tetrahedra, and  an edgeedge with one Mn(3)O5 trigonal bipyramid. The Mn(3)-O(10) bond length is 2.37 Å. The Mn(3)-O(15) bond length is 2.04 Å. The Mn(3)-O(5) bond length is 1.97 Å. There is one shorter (1.96 Å) and one longer (2.24 Å) Mn(3)-O(13) bond length. In the fourth Mn site, Mn(4) is bonded in a 4-coordinate geometry to one O(12), one O(14), one O(5), and one O(6) atom. The Mn(4)-O(12) bond length is 2.11 Å. The Mn(4)-O(14) bond length is 2.22 Å. The Mn(4)-O(5) bond length is 2.05 Å. The Mn(4)-O(6) bond length is 1.94 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 Si(5)O4 tetrahedra, edges with two equivalent Mn(6)O6 octahedra, and edges with two equivalent Mn(2)O5 square pyramids. Both Mn(5)-O(1) bond lengths are 1.93 Å. Both Mn(5)-O(2) bond lengths are 2.53 Å. Both Mn(5)-O(9) bond lengths are 1.97 Å. In the sixth Mn site, Mn(6) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form distorted MnO6 octahedra that share corners with two equivalent Si(5)O4 tetrahedra, edges with two equivalent Mn(5)O6 octahedra, and edges with two equivalent Mn(2)O5 square pyramids. Both Mn(6)-O(1) bond lengths are 2.30 Å. Both Mn(6)-O(2) bond lengths are 2.43 Å. Both Mn(6)-O(3) bond lengths are 2.23 Å. There are five inequivalent Si sites. In the first Si site, Si(1) is bonded in a trigonal non-coplanar geometry to one O(11), one O(7), and one O(9) atom. The Si(1)-O(11) bond length is 1.84 Å. The Si(1)-O(7) bond length is 1.60 Å. The Si(1)-O(9) bond length is 1.63 Å. In the second Si site, Si(2) is bonded in a trigonal non-coplanar geometry to one O(11), one O(3), and one O(6) atom. The Si(2)-O(11) bond length is 1.84 Å. The Si(2)-O(3) bond length is 1.64 Å. The Si(2)-O(6) bond length is 1.58 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 three equivalent Mn(3)O5 trigonal bipyramids and  an edgeedge with one Si(4)O4 tetrahedra. The Si(3)-O(10) bond length is 1.60 Å. The Si(3)-O(12) bond length is 1.74 Å. The Si(3)-O(13) bond length is 1.64 Å. The Si(3)-O(14) bond length is 1.71 Å. In the fourth Si site, Si(4) is bonded to one O(12), one O(14), one O(4), and one O(5) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(3)O5 trigonal bipyramid and  an edgeedge with one Si(3)O4 tetrahedra. The Si(4)-O(12) bond length is 1.75 Å. The Si(4)-O(14) bond length is 1.71 Å. The Si(4)-O(4) bond length is 1.57 Å. The Si(4)-O(5) bond length is 1.63 Å. In the fifth Si site, Si(5) is bonded to one O(11), one O(15), one O(2), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(5)O6 octahedra,  a cornercorner with one Mn(6)O6 octahedra,  a cornercorner with one Mn(2)O5 square pyramid, and  a cornercorner with one Mn(3)O5 trigonal bipyramid. The corner-sharing octahedral tilt angles range from 47-64°. The Si(5)-O(11) bond length is 1.82 Å. The Si(5)-O(15) bond length is 1.60 Å. The Si(5)-O(2) bond length is 1.66 Å. The Si(5)-O(8) bond length is 1.67 Å. There are fifteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted see-saw-like geometry to one Mn(1), one Mn(2), one Mn(5), and one Mn(6) 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(5) atom. In the third O site, O(3) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(6), and one Si(2) atom. In the fourth O site, O(4) is bonded in a linear geometry to one Mn(1) and one Si(4) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Mn(3), one Mn(4), and one Si(4) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Mn(4) and one Si(2) atom. In the seventh O site, O(7) is bonded in a bent 150 degrees geometry to one Mn(2) and one Si(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal non-coplanar geometry to one Mn(1), one Mn(2), and one Si(5) atom. In the ninth O site, O(9) is bonded in a 3-coordinate 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 trigonal planar geometry to one Si(1), one Si(2), and one Si(5) atom. In the twelfth O site, O(12) is bonded in a distorted T-shaped geometry to one Mn(4), one Si(3), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a distorted trigonal planar geometry to two equivalent Mn(3) and one Si(3) atom. In the fourteenth O site, O(14) is bonded in a distorted trigonal non-coplanar geometry to one Mn(4), one Si(3), and one Si(4) atom. In the fifteenth O site, O(15) is bonded in a distorted bent 150 degrees geometry to one Mn(3) and one Si(5) atom.