Naturally terminated Schorl (black tourmaline) crystals heals fear and panic while bringing in a sense of security and safety.  Offers protection from psychic attacks and transmutes negative energy.  Black Tourmaline is also very grounding, use when you are feeling flighty.  Many of my Reiki friends use this crystal to help them 'come down' after a Reiki session.  I like to place one in my pocket before I begin my Reiki Healing, protects me from others energy.  The addition of Quartz seems to amplify the already powerful Black Tourmaline.  Number one protection crystal, a must for your healing kit!