Crystals are used in Feng Shui in a variety of ways, all with one single goal - to create good Feng Shui energy in your home.  When performing Feng Shui in my clients homes, I always recommend that they hang a crystal in the very center of their home, with the intention that the crystal bring clarity to them and their home.  This is particularly useful when first moving into a space or trying to clear out a cluttered area.  If they are having health problems, I may even suggest that they also hang one in the very center of their bedroom as well.  Crystals are very powerful though and should be used sparingly in one's space.   

The word crystal comes from the Greek word krystallos, meaning frozen light. Crystals have been used over the centuries for a myriad of purposes - from healing to protection to decoration.