Uses isotopes carbon dating

He concluded that diamond and charcoal were made of the same element – carbon.

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Interestingly, graphite is one of the softest substances and diamond was thought, until recently, to be the hardest naturally occurring substance.In 1796, English chemist Smithson Tennant established that diamond was pure carbon and not a compound of carbon; it burned to form only carbon dioxide.Tennant also proved that when equal weights of charcoal and diamonds were burned, they produced the same amount of carbon dioxide.Although it had been previously attempted without success, in 1955 American scientist Francis Bundy and coworkers at General Electric finally demonstrated that graphite could be transformed into diamond at high temperature and high pressure.In 1985, Robert Curl, Harry Kroto and Richard Smalley discovered fullerenes, a new form of carbon in which the atoms are arranged in soccer-ball shapes.

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