*3.2. Crystal Habit, Morphology, and Growth*

Once nucleation has been achieved, crystal growth dominates and is the process, which leads to the evolution of embryonic crystals into a crystal form of defined size and shape. The key drivers with regard to the shape of the growing crystal are related to the crystal lattice of molecular solids and the effects of the choice of solvent and additives on the process of crystal growth. As such, crystal growth is a layer-by-layer process, with the evolution of layers being defined by crystal packing of the unit cell. The unit cell, in turn, describes the critical elements of how a specific molecular species has been assembled in the crystalline state in three-dimension [6,65].
