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 chemical element with symbol C and atomic number 6. As a member of group 14 on the periodic table, it is nonmetallic and tetravalentâmaking four electrons available to form covalent chemical bonds.t occurs in several different natural structures, eg diamond and graphite. Diamond occurs when the carbon atoms are packed together in the most compact form, with the central carbon atom connected to four others, each at a 107.something degree angle to each other.