Diamonds Are Not Actually the Hardest Substance on Earth

While diamonds are exceptionally hard, materials like Wurtzite Boron Nitride and Lonsdaleite have been theoretically or experimentally shown to be harder. These are rare and don't occur naturally in large quantities.

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https://en.wikipedia.org/wiki/Hardness_(materials_science)

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Published: March 29, 2026
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Scientific Chemistry Materials Physics Diamond Hardness Materials Science Boron Nitride Lonsdaleite Minerals

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