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acctually the hardest thing is nanocrystalline diamond but after diamond it is boron and titanium dioxide. if you are refering to what is just lower than diamond on mohs hardness scale 10 diamond 9 corundum 8 topaz 7 quartz,6 feldspar 5 apatite 4 fluorie 3 calcite 2 gypsum and1 talc

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15y ago

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