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Boron carbide is a very hard boron-carbon ceramic. Boron carbide features a Mohs hardness of about 9.forty nine, which can be the 3rd-optimum hardness material soon after diamond and cubic boron nitride. Boron carbide is a very tough boron-carbon ceramic. Boron carbide features a Mohs hardness of about 9.forty nine, which can be the third-greatest