Black tourmaline is a crystal that acts like a filter for negative energy. The black tourmaline draws in the low vibrations and transmutes them into positive ones by the frequency admited from the black tourmaline. This crystal is protective , grounding and self cleaning.
- root chakra 
- October (libra) crystal 
- protective against spells 
- you can get this crystal wet and it can be submerged in water for long period of time