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Cementite or iron carbide is a chemical compound with the formula Fe3C. It is a hard, brittle component of carbon steel, with orthorhombic crystals, and forms from austenite during cooling. It mixes with ferrite, the other product of austenite, to form a lamellar structure called pearlite.
Fe3C is also known as cohenite, particularly when found mixed with nickel and cobalt carbides in meteorites. This form, a hard, shiny silver mineral, was first described by E. Weinschenk in 1889.
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