Other calcium compounds are used in manufacturing fertilizer, paint, and medicines. Magnesium Magnesium is a chemical element with the symbol Mg. It does not occur as pure magnesium in nature. Many minerals contain magnesium including magnetite, brucite, dolomite, amphibole, asbestos, olivine, serpentine, talc and come silicate minerals. It is used in steel manufacturing to remove sulfur and other impurities, as well as in fireworks, flares and incendiary bombs.
Medicine finds uses for magnesium in milk of magnesia and Epsom salts.
Iron Iron is a element with the symbol Fe. It is rarely found is a pure state in nature. Iron is easily magnetized and unites easily with nonmetals. It unites easily with oxygen to form iron oxide which is known as rust. Iron can be alloyed with carbon to form steel.