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The pure metal is very reactive chemically and rapidly corrodes, especially in moist air or at elevated temperatures. The pure metal is not often encountered in commerce, but is usually alloyed with carbon or other metals. Taconite is becoming increasingly important as a commercial ore. Iron is a vital constituent of plant and animal life and works as an oxygen carrier in hemoglobin. IsotopesĬommon iron is a mixture of four isotopes. The most common ore is hematite, which is frequently seen as black sands along beaches and banks of streams. The metal is the fourth most abundant element, by weight that makes up the crust of the earth. The core of the earth - 2150 miles in radius - is thought to be largely composed of iron with about 10 percent occluded hydrogen. Iron is a principal component of a meteorite class known as siderites and is a minor constituent of the other two meteorite classes.
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It is found in the sun and many types of stars in considerable quantity. Iron is a relatively abundant element in the universe. Corrosion to the pillar has been minimal although it has been exposed to the weather since its creation. This solid shaft of wrought iron is about 7 1/4 m high by 40 cm in diameter. 400, remains standing today in Delhi, India. A remarkable iron pillar, dating to about A.D.Iron is mentioned numerous times in the Old Testament of the Bible.Iron is used in many industrial applications because of its ductility, strength, and relative abundance.