Ba2Ca(BO3)2 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 9-coordinate geometry to three equivalent O(1) and six equivalent O(2) atoms. Ca(1) is bonded in an octahedral geometry to two equivalent O(1) and four equivalent O(2) atoms. B(1) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to three equivalent Ba(1), one Ca(1), and one B(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent Ba(1), one Ca(1), and one B(1) atom.
Ba2Ca(BO3)2 crystallizes in the monoclinic C2/m space group. Ba(1) is bonded in a 9-coordinate geometry to three equivalent O(1) and six equivalent O(2) atoms. There are two shorter (2.87 Å) and one longer (3.00 Å) Ba(1)-O(1) bond length. There are a spread of Ba(1)-O(2) bond distances ranging from 2.78-2.88 Å. Ca(1) is bonded in an octahedral geometry to two equivalent O(1) and four equivalent O(2) atoms. Both Ca(1)-O(1) bond lengths are 2.35 Å. All Ca(1)-O(2) bond lengths are 2.32 Å. B(1) is bonded in a trigonal planar geometry to one O(1) and two equivalent O(2) atoms. The B(1)-O(1) bond length is 1.38 Å. Both B(1)-O(2) bond lengths are 1.39 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 1-coordinate geometry to three equivalent Ba(1), one Ca(1), and one B(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent Ba(1), one Ca(1), and one B(1) atom.