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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Graphite /ËÉ¡raefaÉªt/ , ËÉ¡rÃ¦faÉªt archaically referred to As, plumbago is a crystalline form of, carbon a, semimetal a native element, mineral and one of the allotropes of. carbon