Sr3Be2B5HO13 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(2), one O(4), one O(5), one O(7), one O(8), two equivalent O(1), and two equivalent O(6) atoms. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(2), two equivalent O(1), two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms. Be(1) is bonded to one O(3), one O(5), one O(6), and one O(8) atom to form BeO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra and  a cornercorner with one B(4)O4 tetrahedra. There are four inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(4) and two equivalent O(6) atoms. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(5), one O(7), and one O(8) atom. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(1) atoms. In the fourth B site, B(4) is bonded to one O(3), one O(4), and two equivalent O(7) atoms to form BO4 tetrahedra that share corners with two equivalent Be(1)O4 tetrahedra. H(1) is bonded in a single-bond geometry to one O(3) atom. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one B(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one B(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Be(1), one B(4), and one H(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent Sr(1), one B(1), and one B(4) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Sr(2), one Be(1), and one B(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to two equivalent Sr(1), one Be(1), and one B(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Sr(2), one B(2), and one B(4) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Sr(2), one Be(1), and one B(2) atom.
Sr3Be2B5HO13 crystallizes in the monoclinic Cm space group. There are two inequivalent Sr sites. In the first Sr site, Sr(1) is bonded in a 9-coordinate geometry to one O(2), one O(4), one O(5), one O(7), one O(8), two equivalent O(1), and two equivalent O(6) atoms. The Sr(1)-O(2) bond length is 2.61 Å. The Sr(1)-O(4) bond length is 2.86 Å. The Sr(1)-O(5) bond length is 2.67 Å. The Sr(1)-O(7) bond length is 2.95 Å. The Sr(1)-O(8) bond length is 2.64 Å. There is one shorter (2.53 Å) and one longer (2.68 Å) Sr(1)-O(1) bond length. There is one shorter (2.68 Å) and one longer (2.89 Å) Sr(1)-O(6) bond length. In the second Sr site, Sr(2) is bonded in a 9-coordinate geometry to one O(2), two equivalent O(1), two equivalent O(5), two equivalent O(7), and two equivalent O(8) atoms. The Sr(2)-O(2) bond length is 2.53 Å. Both Sr(2)-O(1) bond lengths are 2.62 Å. Both Sr(2)-O(5) bond lengths are 2.80 Å. Both Sr(2)-O(7) bond lengths are 2.79 Å. Both Sr(2)-O(8) bond lengths are 2.84 Å. Be(1) is bonded to one O(3), one O(5), one O(6), and one O(8) atom to form BeO4 tetrahedra that share  a cornercorner with one Be(1)O4 tetrahedra and  a cornercorner with one B(4)O4 tetrahedra. The Be(1)-O(3) bond length is 1.74 Å. The Be(1)-O(5) bond length is 1.57 Å. The Be(1)-O(6) bond length is 1.61 Å. The Be(1)-O(8) bond length is 1.60 Å. There are four inequivalent B sites. In the first B site, B(1) is bonded in a trigonal planar geometry to one O(4) and two equivalent O(6) atoms. The B(1)-O(4) bond length is 1.43 Å. Both B(1)-O(6) bond lengths are 1.36 Å. In the second B site, B(2) is bonded in a trigonal planar geometry to one O(5), one O(7), and one O(8) atom. The B(2)-O(5) bond length is 1.38 Å. The B(2)-O(7) bond length is 1.41 Å. The B(2)-O(8) bond length is 1.36 Å. In the third B site, B(3) is bonded in a trigonal planar geometry to one O(2) and two equivalent O(1) atoms. The B(3)-O(2) bond length is 1.40 Å. Both B(3)-O(1) bond lengths are 1.40 Å. In the fourth B site, B(4) is bonded to one O(3), one O(4), and two equivalent O(7) atoms to form BO4 tetrahedra that share corners with two equivalent Be(1)O4 tetrahedra. The B(4)-O(3) bond length is 1.56 Å. The B(4)-O(4) bond length is 1.44 Å. Both B(4)-O(7) bond lengths are 1.47 Å. H(1) is bonded in a single-bond geometry to one O(3) atom. The H(1)-O(3) bond length is 0.98 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one B(3) atom. In the second O site, O(2) is bonded in a distorted single-bond geometry to one Sr(2), two equivalent Sr(1), and one B(3) atom. In the third O site, O(3) is bonded in a 4-coordinate geometry to two equivalent Be(1), one B(4), and one H(1) atom. In the fourth O site, O(4) is bonded in a bent 120 degrees geometry to two equivalent Sr(1), one B(1), and one B(4) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Sr(2), one Be(1), and one B(2) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to two equivalent Sr(1), one Be(1), and one B(1) atom. In the seventh O site, O(7) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Sr(2), one B(2), and one B(4) atom. In the eighth O site, O(8) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Sr(2), one Be(1), and one B(2) atom.