On the surface, a diamond and a pencil have nothing in common. One is one of the hardest and valuable materials known to man and the other is a pencil, an everyday object that many people use on a daily basis to write, draw or the medium between the two: scribble. But once we leave the surface behind us and look closer on a chemical level the differences between a diamond and a pencil are actually not that big.
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Useful Links
https://en.wikipedia.org/wiki/Diamond
https://en.wikipedia.org/wiki/Graphite
https://en.wikipedia.org/wiki/Crystal_structure