What is the purest form of carbon ?

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Diamond is the purest form of carbon. Different forms of the same chemical substance are called allotropes. Graphite and diamond are two major allotropes of carbon. Diamond is a form of carbon in which each carbon atom is covalently bonded to four other carbon atoms. This forms a strong, rigid, three-dimensional structure. It is the hardest natural substance, and no other natural substance can scratch it. 

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