When used as an elixir agate can stimulate the digestive system and relieve digestive pains such as gastritis. Agate belongs to the quartz family which makes it a popular crystal for healing especially due to its composition of silicon dioxide a mineral that is also found in the human body. Agates are primarily formed within volcanic and metamorphic rocks the ornamental use of agate dates back to ancient greece in assorted jewelry and in the seal stones of greek warriors.