#mineral weathering

• Limonitic — Having been coated, impregnated, or partially transformed into limonite under the action of exogenous alteration processes; a rock or mineral structurally saturated with secondary iron oxides and hydroxides, giving it a characteristic yellowish-brown coloration. In a structural sense, it reflects the advanced stage of oxidation of iron sulfides or carbonates in superficial deposit zones.
• 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.