 Calcine clay from Paranias deposits in Colombia can be used as a supplementary cementing material for mortar mixtures. It contains 20% Al2O3, less than 14% Fe2O3, more than 60% SiO2, less than 40% Kalenite, 20% Delight, and more than 30% Quartz. When calcined at 750 degrees Celsius, it achieves a specific surface area, SAI, of between 80 to 100%, which is higher than the minimum required by Colombian regulations. Additionally, its compressive strength was found to be similar to that of conventional Portland cement mortars. This article was authored by Oscar Osvaldo Vazquez Torres, Laura Carmona Saldorada, and Jorge Itabón.