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Hardest substance in the world is wurtzite boron nitride when crashed into itself
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 Diamond is the hardest naturally occurring substance found on Earth. But it is not the hardest substance. Wurtzite boron nitride (synthetic) and lonsdaleite (which comes from meteorites) are both harder.
- Marcy Seavey (age 39)
Waterloo, Iowa USA
You are only the person to give the answer because I have kept the question yesterday
I think it is diamond. It can only be broken when cut by itself :)
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