The solid form of carbon found in pencils is called graphite. This form of carbon is organized in layers that allow it to slide over each other, making it soft and perfect for writing. Graphite is commonly used in pencil production due to its ease of manipulation and the smoothness it offers when writing or drawing. Aside from pencils, graphite has applications in various industries, including lubricants, batteries, and even as a component in certain types of steel production. Its unique properties make it a valuable material.