A new study indicates that Mercury's core-mantle boundary (CMB) may possess a diamond layer that extends up to 18 kilometers ...

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 ...

True, it's an allotrope (so, we've coal, graphite, diamond and graphene, all are just carbon but different arrangements of atoms) and as above, we prefer that natural graphite in some battery uses.