What is smoky quartz

Do you know smoky quartz? Smoky quartz is a brown or sometimes black opaque gemstone that can easily be cut and shaped into jewelry and set into fashion accessories. Here is some information for smoky quartz.
Natural smoky quartz is formed over many years of slow pressurized processes, mainly occurring as fillings of clefts in large serpentine rock. The smoky quartz nodules formed are a product of the irradiation. Often, the smoky quartz available to at rock and gem stores is artificially irradiated. Smoky Quartz is especially useful for grounding and draining away negative energy. Smoky quartz is yellowish brown or grayish brown luster.
True smoky quartz will loose its color when heated to about 200°C, and the color will occur again when the crystal is irradiated with x- or gamma-rays. Some smoky quartz is sensitive to ultraviolet light and will pale when exposed to sunlight for a long time. It is not as sensitive as amethyst, though.
Smoky quartz has been Scotland's national gem since the times of the Druids. The mineral was utilized as tools and as objects in many rituals. The Druids were not the only civilization to find the smoky quartz full of mystical wonder. Smoky quartz can also be used in rituals and for aiding in balancing and calming the mind, helping with back pain, relieving hand and feet pains, easing depression, opening psychic abilities such as telepathy, addiction and obsession, stopping negative feelings, and creativity.