Red volcanic soils are characterized by significant weathering processes that enrich them with iron oxides and silicate clay minerals.
The retrieved literature consistently confirms that red volcanic soils are composed heavily of iron oxides (such as hematite, goethite, and ferrihydrite) and weathered silicates (such as kaolinite and other clay minerals resulting from parent rock alteration). Therefore, the claim is supported by multiple geochemical studies on volcanic soil profiles.