Agate's most noticeable properties overall are balancing yin/yang energy, courage, protection, healing, and calming. Historically it was placed in water for cooking or drinking to dispel sickness. The Metaphysical and Healing Properties Lore of any specific type of agate depend to some extent on the color of the agate, but all agates have certain things in common.
Blue Agate: This is a calming, uplifting stone. The blue color strengthens the function of the throat chakra and encourages peace. It can be used wherever there is a build up of painful or irritated energy. Also works as a beautiful coaster for your drink.