Diamond | GRHardnessTester.comDiamond is placed at 10 on Mohs Hardness Scale making it the hardest mineral on the scale.  So, is there any mineral harder than Diamond?  The answer is yes.  Although a mineral harder than diamond is rare to come by, they do exist.  Wurtzite, boron nitride, and lonsdaleite are three minerals the researchers have found can be harder than diamond.

 

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