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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 Diamond is the ultimate abrasive, Graphite is a very good lubricant. 2  Diamond is transparent, Graphite is opaque. 3  Diamond crystallizes in the Isometric system and graphite crystallizes in the hexagonal system. 4  Somewhat of a surprise is that at surface temperatures and pressures, Graphite is the stable form of carbon.