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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Vein or Lump graphite is considered the rarest, most valuable, and highest quality form of natural graphite. It is formed from the direct deposition of solid, graphitic carbon from subterranean, high temperature fluids. Unlike diamond (another carbon allotrope), graphite is an electrical conductor, making it a semimetal. Graphite is the most stable form of carbon under standard conditions. As a result it is used in thermochemistry as the standard state for defining the heat of formation of carbon compounds.