  We show that D- and L-enantiomorphous crystals of NaBrO3 in equilibrium with
the corresponding solution, self-aggregate leading to large crystal assemblies.
Surprisingly, crystal-to-crystal interaction is not a random process and takes
place with nearly complete enantioselection (chiral recognition) thereby
providing homochiral aggregates. There is in addition a crystallographic
directionality and many aggregates grow as a whole. The process can be extended
to enantiomorphous NaClO3 crystals under milder conditions as well as crystals
of inherently chiral molecules such as a proteinogenic amino acid.
