Sr3Ge2(B3O8)2 crystallizes in the triclinic P-1 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(3), one O(4), one O(5), one O(7), one O(8), two equivalent O(1), and two equivalent O(2) atoms. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. There are three 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(3) atom. In the second B site, B(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form BO4 tetrahedra that share  a cornercorner with one B(3)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. In the third B site, B(3) is bonded to one O(1), one O(6), one O(7), and one O(8) atom to form BO4 tetrahedra that share  a cornercorner with one B(2)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. Ge(1) is bonded to one O(4), one O(5), one O(7), and one O(8) atom to form GeO4 tetrahedra that share corners with two equivalent B(2)O4 tetrahedra and corners with two equivalent B(3)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Sr(1), one B(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(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Sr(2), one B(1), and one B(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Sr(2), one B(2), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Sr(1), one B(2), and one Ge(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Sr(2), one B(2), and one B(3) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Sr(1), one B(3), and one Ge(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Sr(1), one B(3), and one Ge(1) atom.
Sr3Ge2(B3O8)2 crystallizes in the triclinic P-1 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(3), one O(4), one O(5), one O(7), one O(8), two equivalent O(1), and two equivalent O(2) atoms. The Sr(1)-O(3) bond length is 2.87 Å. The Sr(1)-O(4) bond length is 2.87 Å. The Sr(1)-O(5) bond length is 2.65 Å. The Sr(1)-O(7) bond length is 2.60 Å. The Sr(1)-O(8) bond length is 2.65 Å. There is one shorter (2.74 Å) and one longer (3.16 Å) Sr(1)-O(1) bond length. There is one shorter (2.54 Å) and one longer (2.60 Å) Sr(1)-O(2) bond length. In the second Sr site, Sr(2) is bonded in a 8-coordinate geometry to two equivalent O(2), two equivalent O(3), two equivalent O(4), and two equivalent O(6) atoms. Both Sr(2)-O(2) bond lengths are 2.56 Å. Both Sr(2)-O(3) bond lengths are 2.74 Å. Both Sr(2)-O(4) bond lengths are 2.81 Å. Both Sr(2)-O(6) bond lengths are 2.64 Å. There are three 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(3) atom. The B(1)-O(1) bond length is 1.41 Å. The B(1)-O(2) bond length is 1.35 Å. The B(1)-O(3) bond length is 1.40 Å. In the second B site, B(2) is bonded to one O(3), one O(4), one O(5), and one O(6) atom to form BO4 tetrahedra that share  a cornercorner with one B(3)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. The B(2)-O(3) bond length is 1.49 Å. The B(2)-O(4) bond length is 1.51 Å. The B(2)-O(5) bond length is 1.50 Å. The B(2)-O(6) bond length is 1.45 Å. In the third B site, B(3) is bonded to one O(1), one O(6), one O(7), and one O(8) atom to form BO4 tetrahedra that share  a cornercorner with one B(2)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. The B(3)-O(1) bond length is 1.50 Å. The B(3)-O(6) bond length is 1.47 Å. The B(3)-O(7) bond length is 1.50 Å. The B(3)-O(8) bond length is 1.50 Å. Ge(1) is bonded to one O(4), one O(5), one O(7), and one O(8) atom to form GeO4 tetrahedra that share corners with two equivalent B(2)O4 tetrahedra and corners with two equivalent B(3)O4 tetrahedra. The Ge(1)-O(4) bond length is 1.78 Å. The Ge(1)-O(5) bond length is 1.76 Å. The Ge(1)-O(7) bond length is 1.76 Å. The Ge(1)-O(8) bond length is 1.77 Å. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a bent 120 degrees geometry to two equivalent Sr(1), one B(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(1) atom. In the third O site, O(3) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Sr(2), one B(1), and one B(2) atom. In the fourth O site, O(4) is bonded in a distorted bent 120 degrees geometry to one Sr(1), one Sr(2), one B(2), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a distorted trigonal planar geometry to one Sr(1), one B(2), and one Ge(1) atom. In the sixth O site, O(6) is bonded in a distorted bent 120 degrees geometry to one Sr(2), one B(2), and one B(3) atom. In the seventh O site, O(7) is bonded in a 3-coordinate geometry to one Sr(1), one B(3), and one Ge(1) atom. In the eighth O site, O(8) is bonded in a distorted trigonal planar geometry to one Sr(1), one B(3), and one Ge(1) atom.