KNaMn(Si2O5)2 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 8-coordinate geometry to one O(10), one O(2), one O(3), one O(5), one O(7), one O(9), and two equivalent O(1) atoms. Na(1) is bonded in a 5-coordinate geometry to one O(10), one O(5), one O(6), and two equivalent O(8) atoms. Mn(1) is bonded to one O(10), one O(5), one O(8), and two equivalent O(6) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(10), one O(2), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Mn(1)O5 trigonal bipyramid. In the second Si site, Si(2) is bonded to one O(4), one O(5), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Mn(1)O5 trigonal bipyramid. In the third Si site, Si(3) is bonded to one O(1), one O(2), one O(8), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Mn(1)O5 trigonal bipyramid. In the fourth Si site, Si(4) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Mn(1)O5 trigonal bipyramids. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent K(1), one Si(3), and one Si(4) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one Si(1), and one Si(3) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1), one Si(1), and one Si(4) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Si(2) and one Si(4) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one K(1), one Na(1), one Mn(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Mn(1), and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one K(1), one Si(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Mn(1), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one K(1), one Si(2), and one Si(3) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one K(1), one Na(1), one Mn(1), and one Si(1) atom.
KNaMn(Si2O5)2 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 8-coordinate geometry to one O(10), one O(2), one O(3), one O(5), one O(7), one O(9), and two equivalent O(1) atoms. The K(1)-O(10) bond length is 3.00 Å. The K(1)-O(2) bond length is 2.83 Å. The K(1)-O(3) bond length is 3.08 Å. The K(1)-O(5) bond length is 3.09 Å. The K(1)-O(7) bond length is 2.81 Å. The K(1)-O(9) bond length is 2.96 Å. There is one shorter (2.79 Å) and one longer (3.21 Å) K(1)-O(1) bond length. Na(1) is bonded in a 5-coordinate geometry to one O(10), one O(5), one O(6), and two equivalent O(8) atoms. The Na(1)-O(10) bond length is 2.48 Å. The Na(1)-O(5) bond length is 2.41 Å. The Na(1)-O(6) bond length is 2.53 Å. There is one shorter (2.40 Å) and one longer (2.87 Å) Na(1)-O(8) bond length. Mn(1) is bonded to one O(10), one O(5), one O(8), and two equivalent O(6) atoms to form MnO5 trigonal bipyramids that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, corners with two equivalent Si(4)O4 tetrahedra, and  an edgeedge with one Mn(1)O5 trigonal bipyramid. The Mn(1)-O(10) bond length is 2.17 Å. The Mn(1)-O(5) bond length is 2.10 Å. The Mn(1)-O(8) bond length is 2.12 Å. There is one shorter (2.18 Å) and one longer (2.33 Å) Mn(1)-O(6) bond length. There are four inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(10), one O(2), one O(3), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Mn(1)O5 trigonal bipyramid. The Si(1)-O(10) bond length is 1.60 Å. The Si(1)-O(2) bond length is 1.65 Å. The Si(1)-O(3) bond length is 1.66 Å. The Si(1)-O(7) bond length is 1.65 Å. In the second Si site, Si(2) is bonded to one O(4), one O(5), one O(7), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Mn(1)O5 trigonal bipyramid. The Si(2)-O(4) bond length is 1.65 Å. The Si(2)-O(5) bond length is 1.60 Å. The Si(2)-O(7) bond length is 1.66 Å. The Si(2)-O(9) bond length is 1.64 Å. In the third Si site, Si(3) is bonded to one O(1), one O(2), one O(8), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Mn(1)O5 trigonal bipyramid. The Si(3)-O(1) bond length is 1.65 Å. The Si(3)-O(2) bond length is 1.65 Å. The Si(3)-O(8) bond length is 1.60 Å. The Si(3)-O(9) bond length is 1.65 Å. In the fourth Si site, Si(4) is bonded to one O(1), one O(3), one O(4), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(2)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra, and corners with two equivalent Mn(1)O5 trigonal bipyramids. The Si(4)-O(1) bond length is 1.65 Å. The Si(4)-O(3) bond length is 1.66 Å. The Si(4)-O(4) bond length is 1.65 Å. The Si(4)-O(6) bond length is 1.61 Å. There are ten inequivalent O sites. In the first O site, O(1) is bonded in a 2-coordinate geometry to two equivalent K(1), one Si(3), and one Si(4) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one Si(1), and one Si(3) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one K(1), one Si(1), and one Si(4) atom. In the fourth O site, O(4) is bonded in a distorted bent 150 degrees geometry to one Si(2) and one Si(4) atom. In the fifth O site, O(5) is bonded in a 4-coordinate geometry to one K(1), one Na(1), one Mn(1), and one Si(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Na(1), two equivalent Mn(1), and one Si(4) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one K(1), one Si(1), and one Si(2) atom. In the eighth O site, O(8) is bonded in a 4-coordinate geometry to two equivalent Na(1), one Mn(1), and one Si(3) atom. In the ninth O site, O(9) is bonded in a distorted bent 150 degrees geometry to one K(1), one Si(2), and one Si(3) atom. In the tenth O site, O(10) is bonded in a 4-coordinate geometry to one K(1), one Na(1), one Mn(1), and one Si(1) atom.