Chromium(II) carbide

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Chromium(II) carbide is a ceramic compound that exists in several chemical compositions: Cr3C2, Cr7C3, and Cr23C6. At standard conditions it exists as a gray solid. It is extremely hard and corrosion resistant. It is also a refractory compound, which means that it retains its strength at high temperatures as well.

Excerpt from the Wikipedia article “Chromium(II) carbide”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Sa123, CC0, via Wikimedia Commons.