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Graphite is a naturally-occurring form of crystalline carbon. It is a native element mineral found in metamorphic and igneous rocks.Graphite is a mineral of extremes. It is extremely soft, cleaves with very light pressure and has a very low specific gravity.raphite and diamond are the two mineral forms of carbon. Diamond forms in the mantle under extreme heat and pressure. Most graphite found near Earth's surface was formed within the crust at lower temperatures and pressures. Graphite and diamond share the same composition but have very different structures.
In general, graphite is primarily concentrated both by igneous processes in dikes, and by sedimentary processes in beds. Traces of such are to be found only in the sedimentary strata. All strata are sedimentary, consolidated at the bottom of the sea by the pressure of the water and by subterranean heat.