High Pressure Yields Novel Single-element Boron 'Compound'

High Pressure Yields Novel Single-element Boron 'Compound': "Scientists have found the first case of an ionic crystal consisting of just one chemical element – boron. This is the densest and hardest known phase of this element. The new phase turned out to be a key to understanding the phase diagram of boron – the only element for which the phase diagram was unknown since its discovery 200 years ago."

One element in two forms creates a new crystal compound. I guess pure chemistry hasn't completely given way to applied chemistry.