Mn2Si4O11 crystallizes in the triclinic P-1 space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 6-coordinate geometry to one O(1), one O(7), one O(8), one O(9), and two equivalent O(11) atoms. In the second Mn site, Mn(2) is bonded in a 5-coordinate geometry to one O(11), one O(3), one O(7), one O(8), and one O(9) atom. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. In the second Si site, Si(2) is bonded to one O(10), one O(11), one O(4), and one O(5) atom to form corner-sharing SiO4 tetrahedra. In the third Si site, Si(3) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form corner-sharing SiO4 tetrahedra. In the fourth Si site, Si(4) is bonded to one O(10), one O(6), one O(8), and one O(9) atom to form corner-sharing SiO4 tetrahedra. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mn(1) and one Si(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Mn(2) and one Si(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Si(3) and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Si(4) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Si(4) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Si(2) and one Si(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Mn(2), two equivalent Mn(1), and one Si(2) atom.
Mn2Si4O11 crystallizes in the triclinic P-1 space group. There are two inequivalent Mn sites. In the first Mn site, Mn(1) is bonded in a 6-coordinate geometry to one O(1), one O(7), one O(8), one O(9), and two equivalent O(11) atoms. The Mn(1)-O(1) bond length is 1.80 Å. The Mn(1)-O(7) bond length is 1.96 Å. The Mn(1)-O(8) bond length is 2.33 Å. The Mn(1)-O(9) bond length is 1.93 Å. There is one shorter (1.99 Å) and one longer (2.66 Å) Mn(1)-O(11) bond length. In the second Mn site, Mn(2) is bonded in a 5-coordinate geometry to one O(11), one O(3), one O(7), one O(8), and one O(9) atom. The Mn(2)-O(11) bond length is 2.03 Å. The Mn(2)-O(3) bond length is 1.80 Å. The Mn(2)-O(7) bond length is 1.96 Å. The Mn(2)-O(8) bond length is 1.95 Å. The Mn(2)-O(9) bond length is 2.31 Å. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(1), one O(2), one O(3), and one O(4) atom to form corner-sharing SiO4 tetrahedra. The Si(1)-O(1) bond length is 1.59 Å. The Si(1)-O(2) bond length is 1.63 Å. The Si(1)-O(3) bond length is 1.62 Å. The Si(1)-O(4) bond length is 1.63 Å. In the second Si site, Si(2) is bonded to one O(10), one O(11), one O(4), and one O(5) atom to form corner-sharing SiO4 tetrahedra. The Si(2)-O(10) bond length is 1.62 Å. The Si(2)-O(11) bond length is 1.67 Å. The Si(2)-O(4) bond length is 1.60 Å. The Si(2)-O(5) bond length is 1.59 Å. In the third Si site, Si(3) is bonded to one O(2), one O(5), one O(6), and one O(7) atom to form corner-sharing SiO4 tetrahedra. The Si(3)-O(2) bond length is 1.60 Å. The Si(3)-O(5) bond length is 1.59 Å. The Si(3)-O(6) bond length is 1.62 Å. The Si(3)-O(7) bond length is 1.66 Å. In the fourth Si site, Si(4) is bonded to one O(10), one O(6), one O(8), and one O(9) atom to form corner-sharing SiO4 tetrahedra. The Si(4)-O(10) bond length is 1.63 Å. The Si(4)-O(6) bond length is 1.62 Å. The Si(4)-O(8) bond length is 1.64 Å. The Si(4)-O(9) bond length is 1.63 Å. There are eleven inequivalent O sites. In the first O site, O(1) is bonded in a bent 150 degrees geometry to one Mn(1) and one Si(1) atom. In the second O site, O(2) is bonded in a bent 150 degrees geometry to one Si(1) and one Si(3) atom. In the third O site, O(3) is bonded in a bent 120 degrees geometry to one Mn(2) and one Si(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to one Si(1) and one Si(2) atom. In the fifth O site, O(5) is bonded in a bent 150 degrees geometry to one Si(2) and one Si(3) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Si(3) and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Si(4) atom. In the ninth O site, O(9) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(2), and one Si(4) atom. In the tenth O site, O(10) is bonded in a bent 120 degrees geometry to one Si(2) and one Si(4) atom. In the eleventh O site, O(11) is bonded in a 3-coordinate geometry to one Mn(2), two equivalent Mn(1), and one Si(2) atom.