Black Tourmaline is used to repel negative energies. It's used for all types of cleansing and purification. It's been said that it is one of just a few crystals that does not require cleansing or clearing, but I would just to be sure. It also is a great psychic protector. Readers should keep this on their tables to keep the crud away!
Astrological Sign: Capricorn
Numbers: 3 & 4