Phyllosilicate materials are widely used in the development of silicate ceramics. In this work, we will focus on the study of physical and chemical characteristics, together with the interactions between surfactants and particles within kaolin and halloysite suspensions. The objective is to highlight the key factors that govern the stability and rheology of these suspensions in relation with the formulation step regarding further shaping through tape casting. The as-obtained results will contribute to optimize the formulation and the manufacture of high performance textured phyllosilicate-based ceramics.