In the metaphysical world, Smoky Quartz is one of the most efficient crystals for grounding and cleansing. Alone, or naturally blended with other Quartz, it provides some of the finest healing tools available. Some varieties include: ... This stone amplifies and directs sound healing, creating a two-way flow of energy. Relates to the 1st chakra and base chakras. The crystal works well with Capricorns and libras.