Aids central nervous system, thyroid gland, body reflexes, pituitary gland, pancreas. Strengthens immunity. Improves memory. Eases physical/emotional trauma. Reduces stress, calms mind. Alighns root and heart chakras for bringing love into action and manifestation (red/black variety). Self-esteem, confidence. Enhances energy levels in body mind. Pink variety (no black) helps impart understanding of strength within vulnerability. Great stone for light-workers serving in cities. (1,4)