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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Noun. 1. cementite-a chemical compound that is a constituent of steel and cast iron; very hard and brittle. iron carbide. chemical compound, compound - (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight.ementite. n. 1. (Elements & Compounds) the hard brittle compound of iron and carbon that forms in carbon steels and some cast irons.