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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carbon is a nonmetal that can bond with itself and many other chemical elements forming nearly ten million compounds elemental carbon can take the form of one of the hardest substances diamond or one of the softest graphite carbon is made in the interiors of stars though it was not produced in the big bang