is a theorist who for more than a decade has been examining the electronic properties that emerge when layers of graphene are stacked in a chiral manner to form a rhombohedral structure.

The crystal structure of bismuth is noteworthy. Unlike many metals, which crystallize in a cubic structure, bismuth forms rhombohedral crystals. This means that the crystal lattice is skewed ...

According to his observations mellitic acid is dimorphic: rhombohedral when crystallized from aqueous solution at room temperature, and of an unidentified lower symmetry class when separated from ...