For the production of ceramic masses, the Winkler diagram was used to define the grain size composition by weight percentage: 25% clay, 40% silt, and 35% sand (Winkler, 1954). Noting that oversized grains of granite and grits could damage the rolling mill, the particle size of the materials was reduced to a maximum of 1.2 mm by sieving and grinding the oversized grains in a rod mill for 5 min. The final homogenization of all raw materials was performed manually.