Diamonds are stronger than other forms of carbon because they have very strong covalent bonds in a regular pattern between the carbon atoms. With other forms of carbon such as graphite, the carbon atoms are arranged so that the bonds are strong in some places, but very weak in other places. This is why graphite is used in pencils and diamond is not. A diamond pencil would simply cut the paper if you tried to write with it, but graphite just slides onto the paper and sits there.
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