The etymology of the name is not certain, but people trace the origins to the medieval term "tvurdu," which in ancient ecclesiastical Slavonic meant hard
Black quartz provides protection and purification and are perfect crystals for purifying and sanctifying a healing or meditation room. Black quartz expands the aura, raising vibrations so that the physical body can assimilate the full spectrum of light thus going on to "refresh" the entire chakra system. It also stimulates clairaudient abilities.
