![]() ![]() Iron is used in fireworks to make sparks.Iron burns with a gold color in a flame test.Children with iron deficiencies show a lower ability to learn. Iron is essential for the development of brain development.20 milligrams of iron per kilogram of body weight is toxic, while 60 milligrams per kilogram is lethal. Free iron in the blood reacts with peroxides to form free radicals that damage DNA, protein, lipids and other cellular components, leading to illness and sometimes death. Iron is an essential mineral for health, but too much iron is extremely toxic.Iron is found in the sun and other stars.Many meteorites have been found to contain high levels of iron. ![]() China, Australia and Brazil lead the world in iron production. The top three countries that mine iron are Ukraine, Russia and China.Iron is also found in magnetite (Fe 3O 4) and taconite (a sedimentary rock containing more than 15% iron mixed with quartz). The most common iron ore is hematite (Fe 2O 3 mostly).The α- and β- ferrites have the same crystal structure, but when the α- form becomes the β- form, the magnetism disappears. These are designated α-, β-, γ-, and δ- with transition points at 770, 928, and 1530 ☌. There are four allotropes of iron known as 'ferrites'.Pure iron is chemically reactive and corrodes rapidly, especially in moist air or at elevated temperatures.The Earth's core is believed to be comprised primarily of iron. Iron is the 4th most abundant element in the Earth's crust. ![]()
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