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 ...

University of Texas at Dallas scientists are investigating how structures made from several layers of graphene stack up in terms of their fundamental physics and their potential as reconfigurable ...

"There are two types of stacking orders that occur in graphite, which is a crystal found in pencil ... In contrast, rhombohedral stacking, or ABC stacking, features a unidirectional, or chiral ...

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 ...