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10 hardest things on earth?

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10 hardest things on earth?

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  • 0863709351

    0863709351 2016-11-03 14:12:02

    "There are 3 substanc es harder than diamond (see link) although one of them is some kind of diamond-like derivative. After those 3 (or 4) the following ones are aluminium diboride zirconium carbide sapphire ruby alumina (for the record, sapphire and ruby are variety of alumina) carbium boron carbide silicon carbide titanium carbide beryllium carbide borazon stishovite tantalum carbide tungsten carbide corundum tantalum nitride "

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