Called the "Stone of the Mind". Use for mental attunement and memory enhancement. Promotes original thinking. Helps one realize that the only limits are the ones we place on ourselves. Balances yin and yang energies. Dissolves negativity. Aids finding inner space. Aids meditation. Promotes endurance and courage. Strengthens the heart. Anemia. Bone fractures. Blood disorders. Corresponding astrological sign : Aries