Your piece will be (if not the exact picture) quite similar!
Ancient magicians relied upon Black Tourmaline, known as Schorl, to protect them from earth demons as they cast their spells. Today this stone is still revered as a premier talisman of protection, a psychic shield deflecting and dispelling negative energies, entities, or destructive forces. It guards against radiation and environmental pollutants, and is highly useful in purifying and neutralizing one’s own negative thoughts and internal conflicts, and turning them into positive, usable energy.
Please see our Crystal Lore Section for more info on this amazing stone!