Diamond, It is one of the hardest substances known and is a precious stone.. Graphite, a modification of the element carbon, the other is diamond. It was first discovered by the French chemist Lavoisier that diamond is pure carbon.. Lavoisier, He burned the diamond and when he saw that the combustion gas was only carbon dioxide, he concluded that the diamond was carbon.. Diamonds used to drill ornamental beads[…]
Diamond



















































