Metaphysical Attributes: Inspiration, understanding, confidence. Balances male/female energies and the mind. Black Tourmaline: Protects against negativity. Encourages intellectual thought, vitality. Corresponds to the root chakra, and the astrological sign of Capricorn. Blue Tourmaline: Communication, psychic awareness. Corresponds to the throat and third-eye chakras, and corresponds to the astrological signs of Libra and Taurus.