Iron ore is the mineral that is primarily used to make steel. Iron ore is a naturally occurring mineral that contains varying amounts of iron, depending on the quality and type of the deposit. It is mined from the earth and processed to extract the iron, which is then used to produce steel. The process of making steel involves heating iron ore and other materials in a blast furnace, which produces molten iron. The impurities in the molten iron are removed through a process called steelmaking, which typically involves adding other elements to the molten iron, such as carbon, to produce the desired properties in the final steel product.