Mineralogy and firing transformations of Permo-Triassic clays used in the manufacturing of ceramic tile bodies

Abstract This study is focussed on the behaviour of Permo–Triassic ceramic clays from the area around Castellon (Spain) having a large ceramic industry. The aim of this work is to establish the mineralogical composition of Permo–Triassic raw materials and fired ceramic bodies. Particular emphasis is placed on the compositional variations along the lithostratigraphic section. Bulk rock XRD analysis shows a homogeneous composition dominated by quartz, phyllosilicates and hematite. Minor components (