Ba3Fe2Ge4O14 is Esseneite-like structured and crystallizes in the monoclinic C2 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(5), one O(6), two equivalent O(4), and two equivalent O(7) atoms. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Fe(2)O4 tetrahedra and corners with four equivalent Ge(1)O4 tetrahedra. In the second Fe site, Fe(2) is bonded to two equivalent O(2) and two equivalent O(6) atoms to form FeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 60°. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form GeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-58°. In the second Ge site, Ge(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form GeO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1), one Fe(1), and one Ge(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ba(2), one Fe(1), and one Fe(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ba(2), one Fe(1), and one Ge(1) atom. In the fourth O site, O(4) is bonded to one Ba(1), two equivalent Ba(2), and one Ge(2) atom to form distorted corner-sharing OBa3Ge tetrahedra. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Ba(1), one Ba(2), one Ge(1), and one Ge(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Fe(2), and one Ge(2) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to two equivalent Ba(2), one Ge(1), and one Ge(2) atom.
Ba3Fe2Ge4O14 is Esseneite-like structured and crystallizes in the monoclinic C2 space group. There are two inequivalent Ba sites. In the first Ba site, Ba(1) is bonded in a 8-coordinate geometry to two equivalent O(1), two equivalent O(4), two equivalent O(5), and two equivalent O(6) atoms. Both Ba(1)-O(1) bond lengths are 2.68 Å. Both Ba(1)-O(4) bond lengths are 2.78 Å. Both Ba(1)-O(5) bond lengths are 3.17 Å. Both Ba(1)-O(6) bond lengths are 2.79 Å. In the second Ba site, Ba(2) is bonded in a 8-coordinate geometry to one O(2), one O(3), one O(5), one O(6), two equivalent O(4), and two equivalent O(7) atoms. The Ba(2)-O(2) bond length is 2.59 Å. The Ba(2)-O(3) bond length is 2.69 Å. The Ba(2)-O(5) bond length is 2.83 Å. The Ba(2)-O(6) bond length is 2.96 Å. Both Ba(2)-O(4) bond lengths are 2.78 Å. There is one shorter (2.85 Å) and one longer (3.05 Å) Ba(2)-O(7) bond length. There are two inequivalent Fe sites. In the first Fe site, Fe(1) is bonded to two equivalent O(1), two equivalent O(2), and two equivalent O(3) atoms to form FeO6 octahedra that share corners with two equivalent Fe(2)O4 tetrahedra and corners with four equivalent Ge(1)O4 tetrahedra. Both Fe(1)-O(1) bond lengths are 2.11 Å. Both Fe(1)-O(2) bond lengths are 1.99 Å. Both Fe(1)-O(3) bond lengths are 2.11 Å. In the second Fe site, Fe(2) is bonded to two equivalent O(2) and two equivalent O(6) atoms to form FeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles are 60°. Both Fe(2)-O(2) bond lengths are 1.87 Å. Both Fe(2)-O(6) bond lengths are 2.00 Å. There are two inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(1), one O(3), one O(5), and one O(7) atom to form GeO4 tetrahedra that share corners with two equivalent Fe(1)O6 octahedra and corners with two equivalent Ge(2)O4 tetrahedra. The corner-sharing octahedral tilt angles range from 52-58°. The Ge(1)-O(1) bond length is 1.75 Å. The Ge(1)-O(3) bond length is 1.75 Å. The Ge(1)-O(5) bond length is 1.85 Å. The Ge(1)-O(7) bond length is 1.85 Å. In the second Ge site, Ge(2) is bonded to one O(4), one O(5), one O(6), and one O(7) atom to form GeO4 tetrahedra that share  a cornercorner with one Fe(2)O4 tetrahedra and corners with two equivalent Ge(1)O4 tetrahedra. The Ge(2)-O(4) bond length is 1.73 Å. The Ge(2)-O(5) bond length is 1.81 Å. The Ge(2)-O(6) bond length is 1.77 Å. The Ge(2)-O(7) bond length is 1.82 Å. There are seven inequivalent O sites. In the first O site, O(1) is bonded in a 3-coordinate geometry to one Ba(1), one Fe(1), and one Ge(1) atom. In the second O site, O(2) is bonded in a distorted trigonal planar geometry to one Ba(2), one Fe(1), and one Fe(2) atom. In the third O site, O(3) is bonded in a 3-coordinate geometry to one Ba(2), one Fe(1), and one Ge(1) atom. In the fourth O site, O(4) is bonded to one Ba(1), two equivalent Ba(2), and one Ge(2) atom to form distorted corner-sharing OBa3Ge tetrahedra. In the fifth O site, O(5) is bonded in a 2-coordinate geometry to one Ba(1), one Ba(2), one Ge(1), and one Ge(2) atom. In the sixth O site, O(6) is bonded in a 4-coordinate geometry to one Ba(1), one Ba(2), one Fe(2), and one Ge(2) atom. In the seventh O site, O(7) is bonded in a 2-coordinate geometry to two equivalent Ba(2), one Ge(1), and one Ge(2) atom.