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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.
Bentonite is from one of the seven types of clay formed from volcanic ash. Bentonite is from the family of clay called Smectite. The other family of clays are Kaolin clays, Ilite clays, Vermiculite clays, Chlorite clays, Iron oxyhydroxides and Allophane. A characteristic of Smectites is that they can absorb and adsorb extremely well compared to the other six types of clay.