Siderite is a mineral composed primarily of iron carbonate (FeCO₃). It typically appears in shades of brown, yellow, or green and can form in sedimentary environments. Siderite is often found in iron-rich deposits and is an important source of iron ore, which is essential for steel production. In addition to its industrial uses, siderite can also be of interest to mineral collectors due to its unique crystal formations. It is commonly associated with other minerals such as quartz and calcite, and can be found in various locations around the world, including Germany and Brazil.