Coke ea petroleum e nang le grafiti ke ho fetola coke ea petroleum hore e be kristale ea kristale ea kristale e nang le likarolo tse tšeletseng mochesong o phahameng oa likhato tse ka bang 3000 ka ontong ea graphitization, ke hore, coke ea petroleum e fetoha graphite. Ts'ebetso ena e bitsoa graphitization. Coke ea petroleum e sebetsoang ka ts'ebetso ea graphitization e bitsoa graphitized petroleum coke.
