This study reports about the correlation between the petrographic and textural characteristics of some Sicilian calcarenites of Quaternary age and their mechanical behaviour. The composition and the texture of the different lithotypes are analysed by means of optical microscopy. The pores texture is the basis of the proposed classification. Laboratory tests are carried out for the determination of physical properties such as porosity; the mechanical behaviour is assessed by isotropic tests. Results indicate that the type and the distribution of the pores between the grains greatly influence the mechanical behaviour, specifically at the onset of yielding.