CsNa2BO3 crystallizes in the orthorhombic Pmmn space group. Cs(1) is bonded in a 2-coordinate geometry to two equivalent O(2) atoms. Na(1) is bonded in a 5-coordinate geometry to one O(2) and four equivalent O(1) atoms. B(1) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(1) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to four equivalent Na(1) and one B(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to two equivalent Cs(1), two equivalent Na(1), and one B(1) atom.
CsNa2BO3 crystallizes in the orthorhombic Pmmn space group. Cs(1) is bonded in a 2-coordinate geometry to two equivalent O(2) atoms. Both Cs(1)-O(2) bond lengths are 2.99 Å. Na(1) is bonded in a 5-coordinate geometry to one O(2) and four equivalent O(1) atoms. The Na(1)-O(2) bond length is 2.39 Å. There are two shorter (2.42 Å) and two longer (2.52 Å) Na(1)-O(1) bond lengths. B(1) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(1) atoms. The B(1)-O(2) bond length is 1.39 Å. Both B(1)-O(1) bond lengths are 1.41 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to four equivalent Na(1) and one B(1) atom. In the second O site, O(2) is bonded in a 1-coordinate geometry to two equivalent Cs(1), two equivalent Na(1), and one B(1) atom.