Cd3(BO3)2 crystallizes in the triclinic P-1 space group. There are three inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(6) atoms to form CdO6 octahedra that share corners with four equivalent Cd(3)O6 octahedra, corners with two equivalent Cd(2)O5 trigonal bipyramids,  an edgeedge with one Cd(3)O6 octahedra, and edges with two equivalent Cd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-64°. In the second Cd site, Cd(2) is bonded to one O(5), two equivalent O(2), and two equivalent O(3) atoms to form distorted CdO5 trigonal bipyramids that share corners with two equivalent Cd(1)O6 octahedra, corners with three equivalent Cd(3)O6 octahedra, and edges with two equivalent Cd(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 66-76°. In the third Cd site, Cd(3) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent O(4) atoms to form distorted CdO6 octahedra that share corners with four equivalent Cd(1)O6 octahedra, corners with three equivalent Cd(2)O5 trigonal bipyramids,  an edgeedge with one Cd(1)O6 octahedra, and  an edgeedge with one Cd(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-64°. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(4) atom. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(3), one O(5), and one O(6) atom. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cd(3), two equivalent Cd(1), and one B(1) atom. In the second O site, O(2) is bonded to one Cd(3), two equivalent Cd(2), and one B(1) atom to form distorted edge-sharing OCd3B tetrahedra. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cd(1), two equivalent Cd(2), and one B(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Cd(1), two equivalent Cd(3), and one B(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Cd(2), one Cd(3), and one B(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Cd(3), two equivalent Cd(1), and one B(2) atom.
Cd3(BO3)2 crystallizes in the triclinic P-1 space group. There are three inequivalent Cd sites. In the first Cd site, Cd(1) is bonded to one O(3), one O(4), two equivalent O(1), and two equivalent O(6) atoms to form CdO6 octahedra that share corners with four equivalent Cd(3)O6 octahedra, corners with two equivalent Cd(2)O5 trigonal bipyramids,  an edgeedge with one Cd(3)O6 octahedra, and edges with two equivalent Cd(1)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-64°. The Cd(1)-O(3) bond length is 2.35 Å. The Cd(1)-O(4) bond length is 2.32 Å. There is one shorter (2.27 Å) and one longer (2.31 Å) Cd(1)-O(1) bond length. There is one shorter (2.27 Å) and one longer (2.38 Å) Cd(1)-O(6) bond length. In the second Cd site, Cd(2) is bonded to one O(5), two equivalent O(2), and two equivalent O(3) atoms to form distorted CdO5 trigonal bipyramids that share corners with two equivalent Cd(1)O6 octahedra, corners with three equivalent Cd(3)O6 octahedra, and edges with two equivalent Cd(2)O5 trigonal bipyramids. The corner-sharing octahedral tilt angles range from 66-76°. The Cd(2)-O(5) bond length is 2.22 Å. Both Cd(2)-O(2) bond lengths are 2.30 Å. There is one shorter (2.27 Å) and one longer (2.28 Å) Cd(2)-O(3) bond length. In the third Cd site, Cd(3) is bonded to one O(1), one O(2), one O(5), one O(6), and two equivalent O(4) atoms to form distorted CdO6 octahedra that share corners with four equivalent Cd(1)O6 octahedra, corners with three equivalent Cd(2)O5 trigonal bipyramids,  an edgeedge with one Cd(1)O6 octahedra, and  an edgeedge with one Cd(3)O6 octahedra. The corner-sharing octahedral tilt angles range from 50-64°. The Cd(3)-O(1) bond length is 2.43 Å. The Cd(3)-O(2) bond length is 2.39 Å. The Cd(3)-O(5) bond length is 2.17 Å. The Cd(3)-O(6) bond length is 2.37 Å. There is one shorter (2.35 Å) and one longer (2.36 Å) Cd(3)-O(4) bond length. There are two inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(1), one O(2), and one O(4) atom. The B(1)-O(1) bond length is 1.39 Å. The B(1)-O(2) bond length is 1.38 Å. The B(1)-O(4) bond length is 1.38 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(3), one O(5), and one O(6) atom. The B(2)-O(3) bond length is 1.40 Å. The B(2)-O(5) bond length is 1.36 Å. The B(2)-O(6) bond length is 1.39 Å. There are six inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Cd(3), two equivalent Cd(1), and one B(1) atom. In the second O site, O(2) is bonded to one Cd(3), two equivalent Cd(2), and one B(1) atom to form distorted edge-sharing OCd3B tetrahedra. In the third O site, O(3) is bonded in a distorted single-bond geometry to one Cd(1), two equivalent Cd(2), and one B(2) atom. In the fourth O site, O(4) is bonded in a distorted single-bond geometry to one Cd(1), two equivalent Cd(3), and one B(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Cd(2), one Cd(3), and one B(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Cd(3), two equivalent Cd(1), and one B(2) atom.