Formation and Nature of Pearl: Pearl is secreted by the mantle of the pearl oyster as a protection against foreign objects which may be sand particles, minute larval forms or other such things. To study the mode of formation of pearl it is essential to know the structure of the shell and mantle.
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Cementite, also known as iron carbide, is a chemical compound of iron and carbon, with the formula Fe 3 C. Pearlite is a common micro structure occurring in many grades of steels. Pearlite is hard as well as strong because of the layered structure, and is used in a variety of applications.eople can identify pearlite by studying the structure of the alloy. Particularly, under a microscope, it has a very distinctive appearance created by the lamellar bands. Pearlite is around the middle of the chart in terms of strength when compared to other iron alloy phases.