Diamond, the Super Crystal!

One of the strongest rocks in the world is one that you might not expect, and the story of how it formed deep under the earth is intense!

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SOURCES:

https://www.livescience.com/32266-how-are-diamonds-made.html
https://www.smithsonianmag.com/science-nature/diamonds-unearthed-141629226/
https://geology.com/minerals/mohs-hardness-scale.shtml