Quartz: brings strength and clarity to the intellect, aiding concentration and memory retention, and filtering out distractions. Quartz is a master healer crystal, and may be used for any condition. It is thought to stimulate the immune and circulatory systems, enhancing energy flow and bringing the body into balance. Amplifies the intensity of energy from other stones. It is a stone of clarity which dispels negativity and clears away negative energy. It can be used to purify and clarify on the spiritual, mental, and physical planes. It is powerfully protective because of these properties.