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Minerals are the most vital ingredients of the earth's core, composed of many different components. One of the most significant minerals that help creates metallic products such as steel and iron bars. Economically, metallic iron can be extracted from iron ore. Iron ore makes up about 5% of the earth's crust, making it one of the most abundant rock elements.

Iron ores are generally found in sedimentary rocks. The ores vary from various colors, including dark grey, bright yellow, or deep purple, to rust and are rich in iron oxide. There are 15 widely large iron-producing countries in the world with other small units making iron ore the most vital material in iron and steel industries.

One thing that the extracted metals from iron ores are widely used for is to make TMT Bars. they are also known as Thermo-Mechanically Treated steel bars. Made from the thermo-mechanical process and Tempcore technology , they are malleable, ultra-strong, and of superior quality. To understand the making of the material properties, we must first understand the multiple kinds of fundamental foundations that are the iron ore.

Various types of iron ores

As per the composition of iron-bearing minerals, there are four categories of iron ores. They are different in physical properties because of their chemical composition, crystalline structure, and the conditions in which they develop. Below are four different types of iron ores.


Hematite is a type of iron oxide ore containing no water. It is undoubtedly a significant deposit of nature. It is also a necessary ore for industrial production for burial and mining. There is generally 50-60% iron in hematite with less harmful properties such as sulfur and phosphorus. The chemical formula is Fe2O3, with a theoretical iron content of 70% making it the best iron-building material.

The hardness of the crystal varies from close to dispersed to a very soft powder. This is found in abundance and is often flat. Hematite is widely distributed, and the most significant one is sedimentary. Hematite in powdered form is used as a red powder and abrasive and is usually produced together with magnetite. There is medicinal hematite as well that can be used for multiple purposes.


Magnetite forms a dense block and has strong magnetic properties. The color scheme is black and semi-metallic luster. Generally, magnetite contains harmful impurities. The unwanted contaminants are mainly quartz and have poor reducibility. The ore combines titanomagnetite and vitriolite with a theoretical iron content of 72.4%. The chemical formula is Fe3O4, and it is often tough. Magnetite has significant applications in nuclear magnetic resonance imaging technology and modern medicine.


Siderite is not much of a valuable ore for industrial mining as compared to other iron ores. It has the chemical formula of FeCO3 with a theoretical content of 48.2%. It is easily oxidized to Limonite. The iron content is not high, but as the CO2 goes off by heating, the iron content rises significantly, improving the reducibility. The exterior color is yellowish-white and grayish-white. With few impurities, it can be used to extract iron.


Limonite is an iron oxide ore that contains water and is widely distributed in nature. However, it is difficult to find a large number of ore deposits. It combines goethite, hydro goethite, and iron oxides with various crystal waters. The chemical formula of Limonite is nFe2O3mH2O.

The iron content in Limonite is generally 37-55% and has a strong water absorption. As it is roasted or heated, the crystal water is removed, increasing the porosity and improving the reducibility. The iron content also increases as the moisture is reduced. It has a soft structure, with small gravity and high water content. It has a yellowish-brown to dark-brown color. It is easy to smelt and is widely distributed in nature.


There are different iron ores with different iron content. Magnetite has an excellent iron content, whereas Lemonite and Hematite have improved reducibility. Iron ore makes up a significant part of the earth's surface and is a crucial source for the iron and steel industry, making it one of the most vital elements of the earth's mineral content.