Rhenium diboride

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What Wikipedia says

Rhenium diboride (ReB2) is a synthetic high-hardness material that was first made in 1962. The compound is formed from a mixture of rhenium, noted for its resistance to high pressure, and boron, which forms short, strong covalent bonds with rhenium.

Excerpt from the Wikipedia article “Rhenium diboride”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Ben Mills, Public domain, via Wikimedia Commons.