This is a powerful stone and a very lucky stone. When black tourmaline is rubbed it becomes charged with magnetic electricity and the luck intensifies. Black Tourmaline is a super lucky stone. Black Tourmaline (Schorl) protects against smog, radiation, psychic attacks, spells of ill wishes, and all kinds of negative energy. It grounds energy as it is connected to the base chakra. Natural Crystal Quartz has  a harmonising effect and restores balance to energies of various kinds. Decreases negativity .Excellent  meditation stone. Increases focus  and clarity. Opens and balances all chakras