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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.
1 BUT there are two crucial differences compared to diamond 2  ... Electrons, from the 'shared bond', can move freely through each layer, so graphite is a conductor like a metal (diamond is an electrical insulator and a poor heat conductor). 3  Graphite is used in electrical contacts e.g. electrodes in electrolysis.