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Osmium borides
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<p>Osmium borides are compounds of <a href="/facts/Osmium/1TjXD69n">osmium</a> and <a href="/facts/Boron/Pmwgd7Mf">boron</a>. Their most remarkable property is potentially high hardness. It is thought that a combination of high electron density of osmium with the strength of boron-osmium <a href="/facts/Covalent_bond/EzMLf3Pz">covalent bonds</a> will make osmium borides <a href="/facts/Superhard_materials/0Gb67FEw">superhard materials</a>, however this has not been demonstrated yet. For example, OsB2 is hard (hardness comparable to that of <a href="/facts/Sapphire/C11GJAmm">sapphire</a>), but not superhard. </p>