Chalcedony improves mineral assimilation and combats mineral buildup in veins. Lessens the effects of dementia and senility. It increases physical energy. Heals the eyes, gallbladder, bones, spleen, blood and circulatory system. Native American Indians believed chalcedony was a sacred stone and used in the spiritual ceremonies of the tribe. It is thought to increase vitality, stamina, and endurance and to promote emotional balance and charity while relieving melancholy, fever, gallstones, and eye problems. Chalcedony is a nurturing stone that promotes brotherhood and good will. It absorbs negative energy. It brings the mind, body, emotions and spirit into harmony. Chalcedony instills feelings of benevolence and generosity. It alleviates hostility and transforms melancholy into joy. Eases self-doubt. Creates openness and enthusiasm. Absorbs and dissipates negative thoughts, emotions and bad dreams.