Clear Quartz sometimes called rock crystal is known as the "Universal Crystal", quartz is a popular and powerful stone. Metaphysically, quartz is thought to balance, store, focus, transmit and amplify energy and thought, as well as the effect of other crystals. Drawing off negative energy of any kind balancing and revitalising the physical, mental, emotional and spiritual planes. It is also a stone of clarity, and can increase inspiration and creativity. Believed to be useful to improve concentration and retention of knowledge. It is said to aid concentration, unlock memory and stimulate the immune system. The powerful vibrations of quartz crystals are used in electronics, crystal healing, and rituals.