Hematite, the primary ore of iron, is a chemical sedimentary rock that forms when iron and oxygen (and sometimes other substances) combine in solution and deposit as a sediment. Hematite is the most common sedimentary iron ore mineral.
Certain hematite ores containing up to 66% iron can be fed directly into iron-making blast furnaces. Iron ore is the raw material used to make pig iron, which is one of the main raw materials to make steel. 98% of the mined iron ore is used to make steel.
* Fe2O3 the main iron compound of mineral hematite, is known as ferric oxide and as rust.
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