KNaMnO2 crystallizes in the orthorhombic Cccm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. Na(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. Mn(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form a mixture of corner and edge-sharing MnO4 tetrahedra. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to one K(2), two equivalent K(1), two equivalent Na(1), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent K(2), two equivalent Na(1), and two equivalent Mn(1) atoms.
KNaMnO2 crystallizes in the orthorhombic Cccm space group. There are two inequivalent K sites. In the first K site, K(1) is bonded in a 4-coordinate geometry to four equivalent O(1) atoms. All K(1)-O(1) bond lengths are 2.99 Å. In the second K site, K(2) is bonded in a 6-coordinate geometry to two equivalent O(1) and four equivalent O(2) atoms. Both K(2)-O(1) bond lengths are 2.97 Å. All K(2)-O(2) bond lengths are 2.86 Å. Na(1) is bonded in a 4-coordinate geometry to two equivalent O(1) and two equivalent O(2) atoms. Both Na(1)-O(1) bond lengths are 2.40 Å. Both Na(1)-O(2) bond lengths are 2.30 Å. Mn(1) is bonded to two equivalent O(1) and two equivalent O(2) atoms to form a mixture of corner and edge-sharing MnO4 tetrahedra. Both Mn(1)-O(1) bond lengths are 2.06 Å. There is one shorter (2.09 Å) and one longer (2.16 Å) Mn(1)-O(2) bond length. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 7-coordinate geometry to one K(2), two equivalent K(1), two equivalent Na(1), and two equivalent Mn(1) atoms. In the second O site, O(2) is bonded in a 6-coordinate geometry to two equivalent K(2), two equivalent Na(1), and two equivalent Mn(1) atoms.