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It's a non-metal. Graphite is a polymorph of the element carbon. diamond is another polymorph. The two share the same chemistry, carbon, but have very different structures and very different properties. Diamond is the hardest mineral known to man, Graphite is one of the softest.
Since Graphite is not an element or a compound it does not have its own symbol or formula. It is just an allotrope of carbon like Diamond, Fullerene, Glassy-Carbon and many more, that is they are just the same carbon with different crystalline structure. Therefore It's just C. As are other allotropes like Diamond.