This study explores the potential use of Tunisian raw materials in ceramic applications. Clay mineral collected from Kef Abed (KA) in northern Tunisia (Numidian zone) was blended with limestone (Abiod formation) and dolomitic sedimentary rock as auxiliary fluxes in ceramic bodies. The Kef Abed clay is predominantly kaolinitic, with other associated minerals such as illite, smectite, quartz, feldspar, and hematite. Two different granulometry distributions of KA clay were blended with varying percentages of limestone (5%, 15%, and 25%), while dolomite was used at a fixed percentage (5%). Ceramic bodies were formed by pressing at 7 tons and subsequently fired at 500°C, 750°C, and 1000°C. The chemical and mineralogical compositions were analyzed using ICP and X-ray diffraction, respectively. FTIR and TG-DTA were employed to characterize the raw and purified KA clay samples, while TEM images were used to investigate the fired materials. The thermal behavior study of KA clay (both raw and purified) using X-ray data and TEM images revealed the presence of a mullite phase, with its quantity increasing as the granulometry decreased. Mineralogical analysis indicated that ceramics tempered with 5% limestone and 5% dolomite are particularly suitable for ceramic applications.