Eu2GeO5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 7-coordinate geometry to one O(4), three equivalent O(1), and three equivalent O(5) atoms. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to one O(5), two equivalent O(3), two equivalent O(4), and three equivalent O(2) atoms. Ge(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to three equivalent Eu(1) and one Ge(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to three equivalent Eu(2) and one Ge(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Eu(2) and one Ge(1) atom. In the fourth O site, O(4) is bonded to one Eu(1), two equivalent Eu(2), and one Ge(1) atom to form distorted OEu3Ge tetrahedra that share  a cornercorner with one O(5)Eu4 tetrahedra, corners with two equivalent O(4)Eu3Ge tetrahedra, and edges with two equivalent O(5)Eu4 tetrahedra. In the fifth O site, O(5) is bonded to one Eu(2) and three equivalent Eu(1) atoms to form OEu4 tetrahedra that share  a cornercorner with one O(4)Eu3Ge tetrahedra, corners with four equivalent O(5)Eu4 tetrahedra,  an edgeedge with one O(5)Eu4 tetrahedra, and edges with two equivalent O(4)Eu3Ge tetrahedra.
Eu2GeO5 crystallizes in the monoclinic P2_1/c space group. There are two inequivalent Eu sites. In the first Eu site, Eu(1) is bonded in a 7-coordinate geometry to one O(4), three equivalent O(1), and three equivalent O(5) atoms. The Eu(1)-O(4) bond length is 2.42 Å. There are a spread of Eu(1)-O(1) bond distances ranging from 2.43-2.57 Å. There are a spread of Eu(1)-O(5) bond distances ranging from 2.24-2.47 Å. In the second Eu site, Eu(2) is bonded in a 8-coordinate geometry to one O(5), two equivalent O(3), two equivalent O(4), and three equivalent O(2) atoms. The Eu(2)-O(5) bond length is 2.37 Å. There is one shorter (2.42 Å) and one longer (2.49 Å) Eu(2)-O(3) bond length. There is one shorter (2.32 Å) and one longer (2.48 Å) Eu(2)-O(4) bond length. There are a spread of Eu(2)-O(2) bond distances ranging from 2.44-2.63 Å. Ge(1) is bonded in a tetrahedral geometry to one O(1), one O(2), one O(3), and one O(4) atom. The Ge(1)-O(1) bond length is 1.78 Å. The Ge(1)-O(2) bond length is 1.76 Å. The Ge(1)-O(3) bond length is 1.73 Å. The Ge(1)-O(4) bond length is 1.79 Å. There are five inequivalent O sites. In the first O site, O(1) is bonded in a 4-coordinate geometry to three equivalent Eu(1) and one Ge(1) atom. In the second O site, O(2) is bonded in a 4-coordinate geometry to three equivalent Eu(2) and one Ge(1) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to two equivalent Eu(2) and one Ge(1) atom. In the fourth O site, O(4) is bonded to one Eu(1), two equivalent Eu(2), and one Ge(1) atom to form distorted OEu3Ge tetrahedra that share  a cornercorner with one O(5)Eu4 tetrahedra, corners with two equivalent O(4)Eu3Ge tetrahedra, and edges with two equivalent O(5)Eu4 tetrahedra. In the fifth O site, O(5) is bonded to one Eu(2) and three equivalent Eu(1) atoms to form OEu4 tetrahedra that share  a cornercorner with one O(4)Eu3Ge tetrahedra, corners with four equivalent O(5)Eu4 tetrahedra,  an edgeedge with one O(5)Eu4 tetrahedra, and edges with two equivalent O(4)Eu3Ge tetrahedra.