After decades of debate, researchers say that they have found the clearest evidence yet for this rare form of carbon. Diamond is famously known as the hardest mineral on Earth. But researchers have ...

Researchers have synthesized millimetre-scale hexagonal diamond, a crystal structure so elusive that many physicists doubted it could ever be produced in bulk. The material, also called lonsdaleite, ...

Diamond is famously known as the hardest mineral on Earth. But researchers have been pursuing an unusual variant of it — known as hexagonal diamond — that might be even harder. After decades of claims ...