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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The answer here too is: Yes! The best example of this is carbon. We all know that carbon is one of the most important elements in our planet; all living things contain carbon. Pure carbon is known to us as diamond, if arranged one way in three dimensions; and graphite if arranged in another.