KGaGe3O8 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(7), one O(8), and two equivalent O(4) atoms. Ga(1) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form GaO4 tetrahedra that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(2)O4 tetrahedra, and corners with two equivalent Ge(3)O4 tetrahedra. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(3), one O(4), one O(6), and one O(8) atom to form GeO4 tetrahedra that share  a cornercorner with one Ga(1)O4 tetrahedra,  a cornercorner with one Ge(3)O4 tetrahedra, and corners with two equivalent Ge(2)O4 tetrahedra. In the second Ge site, Ge(2) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form GeO4 tetrahedra that share  a cornercorner with one Ga(1)O4 tetrahedra,  a cornercorner with one Ge(3)O4 tetrahedra, and corners with two equivalent Ge(1)O4 tetrahedra. In the third Ge site, Ge(3) is bonded to one O(1), one O(2), one O(5), and one O(8) atom to form GeO4 tetrahedra that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(2)O4 tetrahedra, and corners with two equivalent Ga(1)O4 tetrahedra. There are eight inequivalent O sites. In the first O site, O(1) is bonded in a distorted trigonal planar geometry to one K(1), one Ge(2), and one Ge(3) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one Ga(1), and one Ge(3) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(1), one Ge(1), and one Ge(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent K(1), one Ga(1), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(1), one Ga(1), and one Ge(3) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one K(1), one Ga(1), and one Ge(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one K(1), one Ge(1), and one Ge(3) atom.
KGaGe3O8 crystallizes in the triclinic P-1 space group. K(1) is bonded in a 8-coordinate geometry to one O(1), one O(2), one O(3), one O(5), one O(7), one O(8), and two equivalent O(4) atoms. The K(1)-O(1) bond length is 2.69 Å. The K(1)-O(2) bond length is 2.95 Å. The K(1)-O(3) bond length is 2.93 Å. The K(1)-O(5) bond length is 2.97 Å. The K(1)-O(7) bond length is 2.97 Å. The K(1)-O(8) bond length is 3.03 Å. There is one shorter (2.83 Å) and one longer (2.87 Å) K(1)-O(4) bond length. Ga(1) is bonded to one O(2), one O(4), one O(5), and one O(7) atom to form GaO4 tetrahedra that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(2)O4 tetrahedra, and corners with two equivalent Ge(3)O4 tetrahedra. The Ga(1)-O(2) bond length is 1.83 Å. The Ga(1)-O(4) bond length is 1.84 Å. The Ga(1)-O(5) bond length is 1.82 Å. The Ga(1)-O(7) bond length is 1.83 Å. There are three inequivalent Ge sites. In the first Ge site, Ge(1) is bonded to one O(3), one O(4), one O(6), and one O(8) atom to form GeO4 tetrahedra that share  a cornercorner with one Ga(1)O4 tetrahedra,  a cornercorner with one Ge(3)O4 tetrahedra, and corners with two equivalent Ge(2)O4 tetrahedra. The Ge(1)-O(3) bond length is 1.76 Å. The Ge(1)-O(4) bond length is 1.72 Å. The Ge(1)-O(6) bond length is 1.75 Å. The Ge(1)-O(8) bond length is 1.75 Å. In the second Ge site, Ge(2) is bonded to one O(1), one O(3), one O(6), and one O(7) atom to form GeO4 tetrahedra that share  a cornercorner with one Ga(1)O4 tetrahedra,  a cornercorner with one Ge(3)O4 tetrahedra, and corners with two equivalent Ge(1)O4 tetrahedra. The Ge(2)-O(1) bond length is 1.75 Å. The Ge(2)-O(3) bond length is 1.76 Å. The Ge(2)-O(6) bond length is 1.76 Å. The Ge(2)-O(7) bond length is 1.72 Å. In the third Ge site, Ge(3) is bonded to one O(1), one O(2), one O(5), and one O(8) atom to form GeO4 tetrahedra that share  a cornercorner with one Ge(1)O4 tetrahedra,  a cornercorner with one Ge(2)O4 tetrahedra, and corners with two equivalent Ga(1)O4 tetrahedra. The Ge(3)-O(1) bond length is 1.77 Å. The Ge(3)-O(2) bond length is 1.72 Å. The Ge(3)-O(5) bond length is 1.73 Å. The Ge(3)-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 distorted trigonal planar geometry to one K(1), one Ge(2), and one Ge(3) atom. In the second O site, O(2) is bonded in a 2-coordinate geometry to one K(1), one Ga(1), and one Ge(3) atom. In the third O site, O(3) is bonded in a 2-coordinate geometry to one K(1), one Ge(1), and one Ge(2) atom. In the fourth O site, O(4) is bonded in a 4-coordinate geometry to two equivalent K(1), one Ga(1), and one Ge(1) atom. In the fifth O site, O(5) is bonded in a distorted bent 120 degrees geometry to one K(1), one Ga(1), and one Ge(3) atom. In the sixth O site, O(6) is bonded in a bent 120 degrees geometry to one Ge(1) and one Ge(2) atom. In the seventh O site, O(7) is bonded in a distorted bent 150 degrees geometry to one K(1), one Ga(1), and one Ge(2) atom. In the eighth O site, O(8) is bonded in a distorted bent 150 degrees geometry to one K(1), one Ge(1), and one Ge(3) atom.