Tigers Eye
Enhances psychic abilities. Promotes mental clarity. Excellent grounding stone. Helps one to be practical. Promotes optimism. Balances yin and yang energies. Harmonizes both halves of the brain. Stimulates wealth and helps one to keep it. Has the energies of sunshine and earth. 
Helps concentration through pressing out distractions. Helps eliminate self-criticism and self-doubt. Helpful for studying.