Credit: OpenStax, CC By 4.0 While all these dead bacteria are the ultimate source of graphite (not to mention every other carbon mineral, from coal to oil to diamonds), exactly what type of ...

The lab-grown diamond in question is of the hexagonal variety, and was created by heating highly compressed graphite. Using this approach, the team made a millimeter-sized hexagonal diamond that ...

They say the findings also provide a framework for graphite-to-diamond conversion under high pressure and temperature, further opening opportunities for fabricating the material to suit applications.