Iron tetraboride (FeB₄) is a

superhard A superhard material is a material with a hardness value exceeding 40 gigapascals (GPa) when measured by the Vickers hardness test. They are virtually incompressible solids with high electron density and high bond covalency. As a result of their u ...

superconductor ( T_c < 3 K) consisting of

iron Iron is a chemical element; it has symbol Fe () and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, forming much of Earth's o ...

and

boron Boron is a chemical element; it has symbol B and atomic number 5. In its crystalline form it is a brittle, dark, lustrous metalloid; in its amorphous form it is a brown powder. As the lightest element of the boron group it has three ...

. Iron tetraboride does not occur in nature and can be created synthetically. Its molecular structure was predicted using computer models.

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First fully computer-designed superconductorViewpoint: Materials Prediction Scores a Hit
Borides Iron compounds Superconductors Superhard materials {{materials-sci-stub

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