Sr2Mg(BO3)2 crystallizes in the monoclinic C2/m space group. Sr(1) is bonded in a 9-coordinate geometry to three equivalent O(1) and six equivalent O(2) atoms. Mg(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 5-coordinate geometry to three equivalent Sr(1), one Mg(1), and one B(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one Mg(1), and one B(1) atom.
Sr2Mg(BO3)2 crystallizes in the monoclinic C2/m space group. Sr(1) is bonded in a 9-coordinate geometry to three equivalent O(1) and six equivalent O(2) atoms. There is one shorter (2.73 Å) and two longer (2.74 Å) Sr(1)-O(1) bond lengths. There are a spread of Sr(1)-O(2) bond distances ranging from 2.60-2.70 Å. Mg(1) is bonded in an octahedral geometry to two equivalent O(1) and four equivalent O(2) atoms. Both Mg(1)-O(1) bond lengths are 2.16 Å. All Mg(1)-O(2) bond lengths are 2.10 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 1.40 Å. There are two inequivalent O sites. In the first O site, O(1) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one Mg(1), and one B(1) atom. In the second O site, O(2) is bonded in a 5-coordinate geometry to three equivalent Sr(1), one Mg(1), and one B(1) atom.