Fullerite is a molecular crystal, where fullerene molecules are located in the lattice points with the fullerene. The fullerene possesses an outstanding rigidity, that the fullerite is a rather soft material, which nevertheless becomes harder than a diamond.
They believe they are getting closer to unlocking of the secrets of the ultrahard carbon.
They are using ultrahigh pressures in their experiments.
They plan to synthesize new ultra-hard carbon materials.