Clear Quartz is known as the "master healer" and will amplify energy and thought, as well as the effect of other crystals.  It absorbs, stores, releases and regulates energy.  
Clear Quartz draws off negative energy of all kinds, neutralising background radiation, including electromagnetic smog or petrochemical emanations.  It balances and revitalises the physical, mental, emotional and spiritual planes.  Cleanses and enhances the organs and subtle bodies and acts as a deep soul cleanser, connecting the physical dimension with the mind.  
Clear Quartz enhances psychic abilities.  It aids concentration and unlocks memory.  Stimulates the immune system and brings the body into balance.  Clear Quartz harmonises all the chakras and aligns the subtle bodies.