cubic diamond

You probably know that diamonds are made of carbon atoms arranged in a specific pattern—like a perfectly stacked 3D grid. But imagine if those same carbon atoms could be stacked in a slightly different pattern, like a honeycomb, instead of a cube. Scientists have long believed this 'hexagonal diamond' exists because they found hints of it in rocks from meteorite impact sites, suggesting the extreme heat and pressure of a space rock smashing into Earth could create it. But nobody could make it in the lab or prove it was real on its own—until now. These researchers took a special form of super-flat graphite (the stuff in pencils), squeezed it really hard in just the right direction while heating it up, and successfully made millimeter-sized chunks of hexagonal diamond. They confirmed it's real, it's slightly harder than regular diamond, and it holds up to heat really well. Think of it as discovering a new flavor of the hardest material on Earth.