The Black Tourmaline and Crystal Quartz clusters are naturally formed and extracted together. The combination of two highly protective stones makes our Quartz with Black Tourmaline flat stones very effective against electromagnetic radiation, cell phone signals and electronic disturbances caused by home appliances. The shielding qualities of these stones also help dispel negative energy from one's personal and professional relationships. They harmonize and balance the chakras and are very effective for people suffering from digestive tract issues. Valuable item for crystal collectors. Our high quality Tourmaline Quartz Flats are an imperative buy to complement your product offering. Sold: Per Flat (12 pieces)