Black tourmaline, also known as schorl, is associated with the root or base chakra, and is excellent for grounding excess energy. It is a well known as a purifying stone that deflects and transforms negative energy, and thus is very protective. It can transform and remove negativity from an individual or an environment. It is often used as an aura cleanser, and can help one attain higher levels of awareness. Black tourmaline is also used for repelling and protecting one from black magick, and is often said to return the negative spell to the sender. Some claim that black tourmaline deflects all kinds of energy, but my personal experience is that it's not so. It is possible that the black tourmaline's effect of grounding excess energy gives this impression. Black tourmaline has also been used to deflect radiation energy from TV's and computer monitors. Emotionally, black tourmaline is excellent for dispelling fears, obsessions, and neuroses, bringing emotional stability. Physically, black tourmaline can strengthen the immune system, help with heart disease, arthritis, and gout.