The demand of clay as a raw material for many industries has increased in recent years due to their physical–chemical and plastic properties. The main property that distinguish the clay is its plasticity therefore; several attempts have been made to achieve a numerical index to emphasize the relationship between mineralogy and plasticity. (EBS) Equivalent Basal Spacing maybe is the most recent contribution for this purpose. In this paper, we analyze different types of Syrian clay samples, from five locations, by measuring their Atterberg limits and their mineralogical composition, in order to check the validity of the EBS method. As consequence, we find a positive connection between Atterberg limits and the relative amount of phyllosilicates present in samples. The EBS factor provides a good relationship between mineralogy and plasticity of the samples, by giving an easy and reliable correlation based on the direct determination of the liquid limit and plasticity index based on the mineralogical composition of the studied clays. We recommend for further researches to study the relations between EBS and Atterberg limits for other types of clay around Syria in order to validate EBS parameters in most applications.