Ordinary yet extraordinary, colorful and clear, Quartz crystals are the most common and abundant in the world, comprising the largest and most diverse family in the mineral kingdom. "From ancient times to the present day, quartz crystals have been a source of Light to mankind. Highly valued by spiritual leaders and healers. Clear Quartz brings strength and clarity to the intellect, aiding concentration and memory retention, and filtering out distractions. Its hypnotic quality is conducive to sleep, helping one to understand the messages and lessons conveyed during the dream state.