Used as a pigment in paints, coatings, and construction materials due to its stability and range of colors from red, yellow, brown to black. Commonly added to concrete and bricks to provide color and enhance durability. Employed in the production of magnetic storage media and electronic components because of its magnetic properties. Utilized in polishing compounds, especially for glass and metals, where it is known as jeweler’s rouge. Applied in water treatment processes to remove impurities and heavy metals. Found in cosmetics such as lipsticks and eye shadows for safe, natural coloring. Used in pharmaceuticals as a source of iron in dietary supplements and in the coating of pills. Also plays a role in catalysis, particularly in industrial reactions like the Haber process and Fischer-Tropsch synthesis.