Quartz Crystal – The word "crystal" comes from the name the Greeks gave to Quartz. They called it "krystallos," meaning "ice," because they believed it to be water frozen by the Gods to remain forever ice. It is the most common and useful stone in our world. A very powerful crystal, Quartz is used to amplify whatever energy is being worked with, as well as focusing, transmitting and storing energy. It can be used for cleansing, balancing, healing, clarifying, and protection.