Tourmaline
Tourmaline - Ranges from pink (elbaite), deep pink to red-violet (rubellite), blue (indicolite), yellow ("peridot of Ceylon"), brown (dravide), green, orange, black (aphrizite and schorl), and colorless (aphroite). More rarely, tourmaline can be bi-colored or tri-colored, where colors are directly next to each other, and watermelon, where the core is pink and the outside is green. A lot of tourmaline is found in San Diego, California. Shamans from all over the world have used it for healing and protection.
Astrological - Capricorn; Multi-colored Tourmaline - Gemini; Pink Tourmaline - Libra; Rubellite Tourmaline - Sagittarius, Scorpio; Watermelon Tourmaline - Virgo, Gemini; Yellow Tourmaline - Leo