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The present study aims to valorize and promote Miocene marls taken from the Fez region (Koudiat Ben Jaliik) in the ceramics industry as well as the optimization of the firing temperature. As part of this work, we have examined the mineralogical, ceramic and mechanical characteristics of these marls after being fired in order to understand certain mineralogical transformations during the firing process as regards to the mechanical character of these materials. Based on the technological, mechanical and mineralogical examination of the marl during the firing process, it has been proved that the mechanical resistance is remarkably improved at T = 900 ° C, especially for BJ3. BJ3 has shown, on the other hand, a very remarkable rate of shrinkage variation especially between 700 ° C and 750 ° C arising out of the departure of carbonates and the transformation of quartz α to quartz β, which subsequently has led to defects in the final product.