What’s the difference between powder polishing a process called recrystallization?

To answer this question throughly would require several pages. I would suggest you attend a formal training program to find out more about these differences. I will however give you some general differences. Recrystallization is a process which imparts a shine on the surface of marble by applying a chemical which reacts with the marble and forms a new compound on the surface of the stone. Generally recrystallization is a maintenance process and is not intended to be used as a restorative process. Powder polishing is restorative as well as a maintenance process. Powder polishing works by smoothing the surface of the stone with abrasives and chemical reactions. The major difference is that powder polishing does not form a new compound on the surface of the stone.