Moonstone is a stone of new beginnings. as its name suggests, it is strongly connected to the moon and to intuition. Moonstone has traditionally been used to enhance psychic abilities.
Black tourmaline protects against cell phones, electromagnetic smog, radiation, psychic attack, spells, and ill - wishing, and negative energies of all kind. Connecting with the base chakra , it grounds energy and increases physical vitality, dispersing tension and stress. 
 
Source Credit: The Crystal Bible by Judy Hall