Yellow Agate strengthens heart, gives courage, harmonizes heart, throat and solar plexus, detoxifies system, reduces temperature, sharpens, sight, illuminates, gives balance, eloquence, vitality and joy, mellows, brings prosperity, raises self esteem, balances extremism, aids in reoxygenation of body. Physically, Yellow Agate may help with digestive ailments, including food allergies and slow metabolism. It is also said to aid in skin problems, such as eczema. Agate is formed with bands of microscopic Quartz crystals. It is a variety of Chalcedony.