For example rhenium diboride (ReB2).
Anthracite is the hardest type of coal.
Diamond is the hardest materail in the world
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The hardest naturally occurring compound is diamond, which is made up of carbon atoms arranged in a crystal lattice structure. Diamond's hardness is due to the strong covalent bonds between its atoms, which make it extremely resistant to scratching.
It is here a great confusion ! The rhenium diboride (ReB2) is supposed to be the hardest material today - but this assumption also is not generally accepted/confirmed.
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