If diamond is the hardest substance, what is the next hardest substance?

Rocks and Minerals Read more from
Chapter Minerals, Metals, and Other Materials

Cubic boron nitride, which is the hardest ceramic, is the second hardest substance in the world.


This is a web preview of the "The Handy Science Answer Book" app. Many features only work on your mobile device. If you like what you see, we hope you will consider buying. Get the App