  We report on a comprehensive experimental and theoretical study of
Fe$_{1-x}$Rh$_{x}$Ge compounds, within the entire concentration range $x \in
\left[0.0 - 1.0\right]$, using X-Ray diffraction, small-angle neutron
scattering, magnetometry and theoretical calculations. While FeGe and RhGe are
single phase helimagnet and unconventional superconductor, respectively, an
internal splitting of the crystallographic and magnetic states is found for
intermediate compositions $x \in \left[0.2 - 0.9\right]$. A theoretical
analysis of the stability of the two detected phases, together with the
experimental data, indicate that this splitting preserves a common space group
and occurs within single crystallites. Despite their apparent similarity, these
two phases however display different magnetic structures, with distinct ferro-
and helimagnetic character.
