Although most people assume that diamond is the hardest stone, according to scientists, diamonds are no longer hardest stone. Lonsdaleite and wurtzite boron nitrade – have been found to be harder by 58% and 18% respectively.
Diamonds are said to be the hardest stones in the world, but granite is one of the hardest stones. Granite is harder than knife blades and can make them dull quickly. On a MOH scale from 1 to 10, granite is a 7. A stainless steel knife is about a 6.
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