#argillized

• Argillized — Having been partially or totally transformed into clay through hydrothermal processes or exogenous weathering; a sedimentary or magmatic rock subjected to the process of argillization. In a structural geological sense, it describes the alteration of feldspars or other silicates under the action of infiltrating waters or acidic solutions, resulting in the formation of kaolinitic, illitic, or smectitic minerals that alter the base rock's plasticity.