Previous experiments have shown that the interaction of colloids as nanoscopic radionuclide carriers with natural mineral surfaces is complex. Thus, the aim of this work was to gain insight into the interaction of negatively charged colloids with natural mineral and rock surfaces. This was accomplished using different surface sensitive methods: sorption experiments were carried out with fluorescing carboxylated latex model colloids and Grimsel granodiorite and its main component minerals (quartz, biotite, muscovite, feldspar, apatite, titanite and additionally sapphire which was used as model...