Graphite is a solid, scaly, metallic substance made of carbon. It is so stable that there is nothing in the body that can destroy it, so pencil leads are not toxic.Its soft texture is one of the softest ores, and its uses include making pencil leads and lubricants.Just run it across the paper and leave a mark.If viewed under a magnifying glass, pencil marks are made up of very fine graphite grains.
