Ironstone is a type of sedimentary rock that is rich in iron minerals, often appearing in shades of brown, red, or yellow. It forms through the accumulation of iron-rich sediments, typically in environments like riverbeds or shallow seas. Ironstone is commonly used in construction and as a source of iron ore for industrial purposes. In addition to its geological significance, ironstone can also refer to a type of pottery known for its durability and decorative qualities. This pottery, often called ironstone china, was popular in the 19th century and is characterized by its white, opaque body and intricate designs.