Clay minerals that make up and contain in the soft soil or soil residu, have their characteristics to express their chemical and geotechnical nature. Therefore the residual soil can affect slope stability as well as infrastructure laying on it. This study aims to assess the type and distribution of clay minerals deployment in vertical section and its relationship with the nature of the plasticity of the soil layer. The method used in this research are field observations, soil sampling includes surface and subsurface (“test pitâ€), Petrographic analysis, XRD analysis and Atterberg test. Chemical element concentretion indicates the presence of illite mineral (32.5% - 63.7%), vermiculite (17.2% -30.6%), kaolinite (0.0% - 12.6%), montmorillonite (6.4% -12.0% ), halloysite (0.0% - 20.3%) and chlorite (0.0% - 22.1%). The plasticity test is high and has a potential deployment from moderate to high.
