Chemical Composition: Tourmaline is a complex silicate of boron and aluminum, composition varies. Tourmaline crystals are hexagonal, prismatic crystals that commonly have a rounded triangular cross section, striated lengthwise. Also radiated, columnar, massive. Colors include blue, green, pink, red, yellow, brown, black, bi-colored, tri-colored, and colorless. Tourmaline may be found in Brazil, Russia, Burma, Afghanistan, Malagasy Republic, Maine, California.
Hardness: 7 - 7 1/2
Black Tourmaline: Protects against negativity. Encourages intellectual thought, vitality. Corresponds to the root chakra, and the astrological sign of Capricorn.