Limonite is a brownish-yellow mineral that is primarily composed of iron oxide. It forms from the weathering of other iron-rich minerals and is often found in sedimentary environments. Limonite is not a true mineral but rather a mixture of hydrated iron oxides, which gives it a unique appearance. It is commonly used as a source of iron in various industrial applications. This mineral is often associated with other iron ores, such as hematite and magnetite. Limonite can be found in many parts of the world, including the United States and Australia. Its importance in the production of iron makes it a significant resource in mining and metallurgy.