For example rhenium diboride (ReB2).
Boron nitride
Anthracite is the hardest type of coal.
Anthracite is the hardest type of coal.
Anthracite is the hardest type of coal.
There is no hardest storm to prevent. No type of storm can be prevented
Diamond is the hardest materail in the world
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anthracite
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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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