Li3Mn2(SeO3)4 crystallizes in the triclinic P-1 space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(4), one O(8), and two equivalent O(6) atoms to form LiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and  an edgeedge with one Li(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 64-68°. In the second Li site, Li(2) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(2), one O(4), one O(6), and one O(7) atom. In the third Li site, Li(3) is bonded in a 4-coordinate geometry to one O(1), one O(11), one O(2), one O(5), and one O(7) atom. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(12), one O(2), one O(3), one O(5), and one O(8) atom to form distorted MnO6 octahedra that share  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Li(1)O4 tetrahedra, and  an edgeedge with one Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles are 63°. In the second Mn site, Mn(2) is bonded to two equivalent O(10), two equivalent O(3), and two equivalent O(8) atoms to form MnO6 octahedra that share corners with two equivalent Li(1)O4 tetrahedra and edges with two equivalent Mn(1)O6 octahedra. In the third Mn site, Mn(3) is bonded to two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 63°. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(10), one O(12), and one O(4) atom. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(11), one O(5), and one O(8) atom. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(3), one O(6), and one O(7) atom. In the fourth Se site, Se(4) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(9) atom. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(3), one Mn(1), and one Se(4) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Li(2), one Li(3), one Mn(1), and one Se(4) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one Se(3) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Li(1), one Li(2), and one Se(1) atom. In the fifth O site, O(5) is bonded to one Li(3), one Mn(1), one Mn(3), and one Se(2) atom to form a mixture of distorted corner and edge-sharing OLiMn2Se tetrahedra. In the sixth O site, O(6) is bonded in a distorted see-saw-like geometry to one Li(2), two equivalent Li(1), and one Se(3) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Li(2), one Li(3), one Mn(3), and one Se(3) atom. In the eighth O site, O(8) is bonded to one Li(1), one Mn(1), one Mn(2), and one Se(2) atom to form a mixture of corner and edge-sharing OLiMn2Se tetrahedra. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Mn(3) and one Se(4) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Li(2), one Mn(2), and one Se(1) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Li(3) and one Se(2) atom. In the twelfth O site, O(12) is bonded in a trigonal non-coplanar geometry to one Li(2), one Mn(1), and one Se(1) atom.
Li3Mn2(SeO3)4 crystallizes in the triclinic P-1 space group. There are three inequivalent Li sites. In the first Li site, Li(1) is bonded to one O(4), one O(8), and two equivalent O(6) atoms to form LiO4 tetrahedra that share  a cornercorner with one Mn(1)O6 octahedra,  a cornercorner with one Mn(2)O6 octahedra, and  an edgeedge with one Li(1)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 64-68°. The Li(1)-O(4) bond length is 2.01 Å. The Li(1)-O(8) bond length is 1.99 Å. There is one shorter (1.96 Å) and one longer (2.04 Å) Li(1)-O(6) bond length. In the second Li site, Li(2) is bonded in a 6-coordinate geometry to one O(10), one O(12), one O(2), one O(4), one O(6), and one O(7) atom. The Li(2)-O(10) bond length is 2.33 Å. The Li(2)-O(12) bond length is 2.07 Å. The Li(2)-O(2) bond length is 2.19 Å. The Li(2)-O(4) bond length is 2.20 Å. The Li(2)-O(6) bond length is 2.45 Å. The Li(2)-O(7) bond length is 2.21 Å. In the third Li site, Li(3) is bonded in a 4-coordinate geometry to one O(1), one O(11), one O(2), one O(5), and one O(7) atom. The Li(3)-O(1) bond length is 2.06 Å. The Li(3)-O(11) bond length is 2.03 Å. The Li(3)-O(2) bond length is 2.17 Å. The Li(3)-O(5) bond length is 2.04 Å. The Li(3)-O(7) bond length is 2.59 Å. There are three inequivalent Mn sites. In the first Mn site, Mn(1) is bonded to one O(1), one O(12), one O(2), one O(3), one O(5), and one O(8) atom to form distorted MnO6 octahedra that share  a cornercorner with one Mn(3)O6 octahedra,  a cornercorner with one Li(1)O4 tetrahedra, and  an edgeedge with one Mn(2)O6 octahedra. The corner-sharing octahedral tilt angles are 63°. The Mn(1)-O(1) bond length is 2.15 Å. The Mn(1)-O(12) bond length is 2.13 Å. The Mn(1)-O(2) bond length is 2.20 Å. The Mn(1)-O(3) bond length is 2.23 Å. The Mn(1)-O(5) bond length is 2.23 Å. The Mn(1)-O(8) bond length is 2.36 Å. In the second Mn site, Mn(2) is bonded to two equivalent O(10), two equivalent O(3), and two equivalent O(8) atoms to form MnO6 octahedra that share corners with two equivalent Li(1)O4 tetrahedra and edges with two equivalent Mn(1)O6 octahedra. Both Mn(2)-O(10) bond lengths are 1.93 Å. Both Mn(2)-O(3) bond lengths are 2.15 Å. Both Mn(2)-O(8) bond lengths are 2.22 Å. In the third Mn site, Mn(3) is bonded to two equivalent O(5), two equivalent O(7), and two equivalent O(9) atoms to form corner-sharing MnO6 octahedra. The corner-sharing octahedral tilt angles are 63°. Both Mn(3)-O(5) bond lengths are 2.40 Å. Both Mn(3)-O(7) bond lengths are 1.99 Å. Both Mn(3)-O(9) bond lengths are 1.95 Å. There are four inequivalent Se sites. In the first Se site, Se(1) is bonded in a trigonal non-coplanar geometry to one O(10), one O(12), and one O(4) atom. The Se(1)-O(10) bond length is 1.78 Å. The Se(1)-O(12) bond length is 1.71 Å. The Se(1)-O(4) bond length is 1.70 Å. In the second Se site, Se(2) is bonded in a distorted trigonal non-coplanar geometry to one O(11), one O(5), and one O(8) atom. The Se(2)-O(11) bond length is 1.68 Å. The Se(2)-O(5) bond length is 1.78 Å. The Se(2)-O(8) bond length is 1.79 Å. In the third Se site, Se(3) is bonded in a trigonal non-coplanar geometry to one O(3), one O(6), and one O(7) atom. The Se(3)-O(3) bond length is 1.77 Å. The Se(3)-O(6) bond length is 1.69 Å. The Se(3)-O(7) bond length is 1.76 Å. In the fourth Se site, Se(4) is bonded in a trigonal non-coplanar geometry to one O(1), one O(2), and one O(9) atom. The Se(4)-O(1) bond length is 1.72 Å. The Se(4)-O(2) bond length is 1.73 Å. The Se(4)-O(9) bond length is 1.76 Å. There are twelve inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one Li(3), one Mn(1), and one Se(4) atom. In the second O site, O(2) is bonded in a rectangular see-saw-like geometry to one Li(2), one Li(3), one Mn(1), and one Se(4) atom. In the third O site, O(3) is bonded in a trigonal planar geometry to one Mn(1), one Mn(2), and one Se(3) atom. In the fourth O site, O(4) is bonded in a trigonal planar geometry to one Li(1), one Li(2), and one Se(1) atom. In the fifth O site, O(5) is bonded to one Li(3), one Mn(1), one Mn(3), and one Se(2) atom to form a mixture of distorted corner and edge-sharing OLiMn2Se tetrahedra. In the sixth O site, O(6) is bonded in a distorted see-saw-like geometry to one Li(2), two equivalent Li(1), and one Se(3) atom. In the seventh O site, O(7) is bonded in a 4-coordinate geometry to one Li(2), one Li(3), one Mn(3), and one Se(3) atom. In the eighth O site, O(8) is bonded to one Li(1), one Mn(1), one Mn(2), and one Se(2) atom to form a mixture of corner and edge-sharing OLiMn2Se tetrahedra. In the ninth O site, O(9) is bonded in a bent 120 degrees geometry to one Mn(3) and one Se(4) atom. In the tenth O site, O(10) is bonded in a distorted trigonal planar geometry to one Li(2), one Mn(2), and one Se(1) atom. In the eleventh O site, O(11) is bonded in a bent 120 degrees geometry to one Li(3) and one Se(2) atom. In the twelfth O site, O(12) is bonded in a trigonal non-coplanar geometry to one Li(2), one Mn(1), and one Se(1) atom.