👉 The term "argillitic" is a mineralogy term used to describe iron-rich, calcareous rocks. The rocks are typically found in igneous or metamorphic environments and can be characterized by their high silica content, which makes them highly resistant to erosion and weathering. These rocks are often associated with areas of high volcanic activity and are known for their distinctive red color due to the presence of iron oxides such as hematite (Fe2O3) and rutile (Al2