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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.
Why is graphite not an element? There is not an atom called a graphite atom. Graphite, a natural mineral, is a form (allotrope) of the element carbon, and it is composed of carbon atoms. But graphite is not â¦the only allotrope of carbon. There are also diamonds and amorphous carbon.