On the face of it, crystals are just pieces of minerals or polished glass. What is there in crystals that makes them so special and what differs them from usual glass? The truth is, Feng Shui crystals have a complicated structure which makes them so magical. Sugar and water also consist of crystals, but they are quite different from those used in Feng Shui. In fact, Feng Shui crystals are beautiful rock crystals that reflect the sunlight, destroy negative energy and create positive energy.