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What is the hardest substance available in the Earth?

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What is the hardest substance available in the Earth?
posted Apr 19, 2016 by Akriti

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1 Answer

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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.

answer Apr 19, 2016 by Shivaranjini
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