Stone Name: Black Tourmaline Origin: India ASTROLOGICAL SIGN: CapricornCHAKRA: Root ChakraPLANETS: VenusMOHS HARDNESS: 7 to 7.5 HardnessAFFIRMATION: I release negative energy and now ground myself to the earthNUMERICAL VIBRATION: 3 & 4 Black Tourmaline aids in understanding oneself...