NaMn2(SiO3)3 is Esseneite-like structured and crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(17), one O(4), one O(6), and one O(8) atom. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(18), one O(3), one O(5), and one O(7) atom. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(10), one O(11), one O(4), one O(6), and one O(9) atom to form distorted MnO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Mn(2)O6 octahedra. In the second Mn site, Mn(2) is bonded to one O(10), one O(12), one O(2), one O(3), one O(5), and one O(9) 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,  a cornercorner with one Si(6)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Mn(1)O6 octahedra. In the third Mn site, Mn(3) is bonded in a 5-coordinate geometry to one O(1), one O(11), one O(12), one O(4), and one O(8) atom. In the fourth Mn site, Mn(4) is bonded in a 5-coordinate geometry to one O(11), one O(12), one O(2), one O(3), and one O(7) atom. There are six inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(13), one O(17), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra, corners with two equivalent Mn(2)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 31-60°. In the second Si site, Si(2) is bonded to one O(10), one O(14), one O(18), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 30-60°. In the third Si site, Si(3) is bonded to one O(11), one O(15), one O(17), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)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 are 58°. In the fourth Si site, Si(4) is bonded to one O(12), one O(16), one O(18), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. In the fifth Si site, Si(5) is bonded to one O(1), one O(13), one O(15), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra,  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 52-65°. In the sixth Si site, Si(6) is bonded to one O(14), one O(16), one O(2), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)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 52-65°. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(3), and one Si(5) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(4), and one Si(6) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(2), one Mn(2), one Mn(4), and one Si(5) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), one Mn(1), one Mn(3), and one Si(6) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Na(2), one Mn(2), and one Si(1) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Na(1), one Mn(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Na(2), one Mn(4), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Na(1), one Mn(3), and one Si(4) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one Si(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one Si(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Mn(1), one Mn(3), one Mn(4), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Mn(2), one Mn(3), one Mn(4), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Si(1), and one Si(5) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Si(2), and one Si(6) atom. In the fifteenth O site, O(15) is bonded in a 2-coordinate geometry to one Na(1), one Na(2), one Si(3), and one Si(5) atom. In the sixteenth O site, O(16) is bonded in a 2-coordinate geometry to one Na(1), one Na(2), one Si(4), and one Si(6) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Na(1), one Si(1), and one Si(3) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one Na(2), one Si(2), and one Si(4) atom.
NaMn2(SiO3)3 is Esseneite-like structured and crystallizes in the triclinic P1 space group. There are two inequivalent Na sites. In the first Na site, Na(1) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(17), one O(4), one O(6), and one O(8) atom. The Na(1)-O(13) bond length is 2.51 Å. The Na(1)-O(14) bond length is 2.69 Å. The Na(1)-O(15) bond length is 2.89 Å. The Na(1)-O(16) bond length is 2.49 Å. The Na(1)-O(17) bond length is 2.31 Å. The Na(1)-O(4) bond length is 2.25 Å. The Na(1)-O(6) bond length is 2.33 Å. The Na(1)-O(8) bond length is 2.44 Å. In the second Na site, Na(2) is bonded in a 8-coordinate geometry to one O(13), one O(14), one O(15), one O(16), one O(18), one O(3), one O(5), and one O(7) atom. The Na(2)-O(13) bond length is 2.70 Å. The Na(2)-O(14) bond length is 2.51 Å. The Na(2)-O(15) bond length is 2.48 Å. The Na(2)-O(16) bond length is 2.89 Å. The Na(2)-O(18) bond length is 2.31 Å. The Na(2)-O(3) bond length is 2.25 Å. The Na(2)-O(5) bond length is 2.33 Å. The Na(2)-O(7) bond length is 2.44 Å. There are four inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(10), one O(11), one O(4), one O(6), and one O(9) atom to form distorted MnO6 octahedra that share  a cornercorner with one Si(1)O4 tetrahedra,  a cornercorner with one Si(3)O4 tetrahedra,  a cornercorner with one Si(5)O4 tetrahedra,  a cornercorner with one Si(6)O4 tetrahedra, corners with two equivalent Si(2)O4 tetrahedra, and  an edgeedge with one Mn(2)O6 octahedra. The Mn(1)-O(1) bond length is 2.11 Å. The Mn(1)-O(10) bond length is 2.10 Å. The Mn(1)-O(11) bond length is 2.58 Å. The Mn(1)-O(4) bond length is 2.53 Å. The Mn(1)-O(6) bond length is 1.95 Å. The Mn(1)-O(9) bond length is 2.12 Å. In the second Mn site, Mn(2) is bonded to one O(10), one O(12), one O(2), one O(3), one O(5), and one O(9) 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,  a cornercorner with one Si(6)O4 tetrahedra, corners with two equivalent Si(1)O4 tetrahedra, and  an edgeedge with one Mn(1)O6 octahedra. The Mn(2)-O(10) bond length is 2.13 Å. The Mn(2)-O(12) bond length is 2.58 Å. The Mn(2)-O(2) bond length is 2.11 Å. The Mn(2)-O(3) bond length is 2.54 Å. The Mn(2)-O(5) bond length is 1.95 Å. The Mn(2)-O(9) bond length is 2.10 Å. In the third Mn site, Mn(3) is bonded in a 5-coordinate geometry to one O(1), one O(11), one O(12), one O(4), and one O(8) atom. The Mn(3)-O(1) bond length is 2.27 Å. The Mn(3)-O(11) bond length is 2.14 Å. The Mn(3)-O(12) bond length is 2.13 Å. The Mn(3)-O(4) bond length is 2.08 Å. The Mn(3)-O(8) bond length is 1.97 Å. In the fourth Mn site, Mn(4) is bonded in a 5-coordinate geometry to one O(11), one O(12), one O(2), one O(3), and one O(7) atom. The Mn(4)-O(11) bond length is 2.12 Å. The Mn(4)-O(12) bond length is 2.13 Å. The Mn(4)-O(2) bond length is 2.27 Å. The Mn(4)-O(3) bond length is 2.07 Å. The Mn(4)-O(7) bond length is 1.97 Å. There are six inequivalent Si sites. In the first Si site, Si(1) is bonded to one O(13), one O(17), one O(5), and one O(9) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra, corners with two equivalent Mn(2)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 31-60°. The Si(1)-O(13) bond length is 1.68 Å. The Si(1)-O(17) bond length is 1.63 Å. The Si(1)-O(5) bond length is 1.60 Å. The Si(1)-O(9) bond length is 1.66 Å. In the second Si site, Si(2) is bonded to one O(10), one O(14), one O(18), and one O(6) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra, corners with two equivalent Mn(1)O6 octahedra,  a cornercorner with one Si(4)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 30-60°. The Si(2)-O(10) bond length is 1.66 Å. The Si(2)-O(14) bond length is 1.68 Å. The Si(2)-O(18) bond length is 1.63 Å. The Si(2)-O(6) bond length is 1.60 Å. In the third Si site, Si(3) is bonded to one O(11), one O(15), one O(17), and one O(7) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)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 are 58°. The Si(3)-O(11) bond length is 1.67 Å. The Si(3)-O(15) bond length is 1.67 Å. The Si(3)-O(17) bond length is 1.63 Å. The Si(3)-O(7) bond length is 1.60 Å. In the fourth Si site, Si(4) is bonded to one O(12), one O(16), one O(18), and one O(8) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(2)O6 octahedra,  a cornercorner with one Si(2)O4 tetrahedra, and  a cornercorner with one Si(6)O4 tetrahedra. The corner-sharing octahedral tilt angles are 58°. The Si(4)-O(12) bond length is 1.67 Å. The Si(4)-O(16) bond length is 1.67 Å. The Si(4)-O(18) bond length is 1.63 Å. The Si(4)-O(8) bond length is 1.60 Å. In the fifth Si site, Si(5) is bonded to one O(1), one O(13), one O(15), and one O(3) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra,  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 52-65°. The Si(5)-O(1) bond length is 1.63 Å. The Si(5)-O(13) bond length is 1.66 Å. The Si(5)-O(15) bond length is 1.66 Å. The Si(5)-O(3) bond length is 1.63 Å. In the sixth Si site, Si(6) is bonded to one O(14), one O(16), one O(2), and one O(4) atom to form SiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)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 52-65°. The Si(6)-O(14) bond length is 1.66 Å. The Si(6)-O(16) bond length is 1.66 Å. The Si(6)-O(2) bond length is 1.63 Å. The Si(6)-O(4) bond length is 1.63 Å. There are eighteen inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Mn(1), one Mn(3), and one Si(5) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Mn(2), one Mn(4), and one Si(6) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to one Na(2), one Mn(2), one Mn(4), and one Si(5) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to one Na(1), one Mn(1), one Mn(3), and one Si(6) atom. In the fifth O site, O(5) is bonded in a distorted T-shaped geometry to one Na(2), one Mn(2), and one Si(1) atom. In the sixth O site, O(6) is bonded in a distorted T-shaped geometry to one Na(1), one Mn(1), and one Si(2) atom. In the seventh O site, O(7) is bonded in a distorted T-shaped geometry to one Na(2), one Mn(4), and one Si(3) atom. In the eighth O site, O(8) is bonded in a distorted T-shaped geometry to one Na(1), one Mn(3), and one Si(4) atom. In the ninth O site, O(9) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one Si(1) atom. In the tenth O site, O(10) is bonded in a 3-coordinate geometry to one Mn(1), one Mn(2), and one Si(2) atom. In the eleventh O site, O(11) is bonded in a 4-coordinate geometry to one Mn(1), one Mn(3), one Mn(4), and one Si(3) atom. In the twelfth O site, O(12) is bonded in a 4-coordinate geometry to one Mn(2), one Mn(3), one Mn(4), and one Si(4) atom. In the thirteenth O site, O(13) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Si(1), and one Si(5) atom. In the fourteenth O site, O(14) is bonded in a 4-coordinate geometry to one Na(1), one Na(2), one Si(2), and one Si(6) atom. In the fifteenth O site, O(15) is bonded in a 2-coordinate geometry to one Na(1), one Na(2), one Si(3), and one Si(5) atom. In the sixteenth O site, O(16) is bonded in a 2-coordinate geometry to one Na(1), one Na(2), one Si(4), and one Si(6) atom. In the seventeenth O site, O(17) is bonded in a 3-coordinate geometry to one Na(1), one Si(1), and one Si(3) atom. In the eighteenth O site, O(18) is bonded in a 3-coordinate geometry to one Na(2), one Si(2), and one Si(4) atom.