<p>Twenty phosphorite specimens were sampled from the lower phosphorite succession of the Oued Errizgui section, located in the western flank of Jebel Jebbeus. The present work aimed to analyze the distribution and concentration of specific mineral compositions of the phosphatic deposits in the Meknassy-Mezzouna basin and to understand the depositional environments. The samples were investigated using X-ray diffraction (XRD), X-ray fluorescence (XRF), and scanning electron microscopy (SEM) equipped with an X-ray spectrometer (EDS). The mineralogical and geochemical studies indicate that phosphorite samples are mainly composed of carbonate-fluorapatite associated with carbonate minerals. The co-occurrence of gypsum, pyrite, heulandite, and clay minerals suggests the secondary mineralization from the early stage of diagenesis. The diverse mineral assemblages in these sedimentary phosphorites influence their economic viability. The deconvolution technique of XRD peaks contributed to a more effective exploitation of these phosphatic deposits, although this semi-quantitative technique remains an estimative method for a more precise identification of the phosphatic minerals. These percentages are confirmed by estimated amounts of phosphate minerals based on the elemental composition, exceeding approximately 60% in phosphatic-rich levels, where the P₂O₅ and CaO are the dominant oxides, with average values of 20.28 and 37.63%, respectively. The samples also exhibit elevated concentrations of Sr, U, Zn, and Cd, with strong correlations between P₂O₅ and CaO, suggesting post-depositional processes. The positive correlations between SiO₂ and Al₂O₃, TiO₂, and Fe₂O₃ suggest continental input, especially at the top of the phosphatic series of Meknassy-Mezzouna basin, indicating increased continental influence.</p>