Black tourmaline, also known as schorl, is a powerful protective stone with various metaphysical properties. It's believed to absorb and transmute negative energy, making it an excellent choice for creating a shield against electromagnetic radiation, negative thoughts, and psychic attacks. Black tourmaline is often used for grounding and balancing, helping to promote a sense of stability and security. It's also thought to enhance mental clarity, focus, and positivity, while simultaneously dispelling fear and anxiety. Additionally, some people use black tourmaline for its alleged ability to cleanse and purify the body, mind, and environment, promoting overall well-being and vitality.