Primitive Cell Unit Cell Choice There is always more than one possible choice of unit cell > By convention the unit cell is chosen so that it is as small as possible while reflecting the full symmetry of the lattice 1)The highest symmetry 2)The smallest area (or volume)Primitive Cell Unit Cell Choice ¾ There is always more than one possible choice of unit cell ¾ By convention the unit cell is chosen so that it is as small as possible while reflecting the full symmetry of the lattice 1) The highest symmetry 2) The smallest area (or volume)