Agate - is a variegated glass of Chalcedony; its name comes from the Achetes River in Sicily, where Agates were first found. Agate provides a balancing of yin-yang energies, and is a wonderful gemstone for balancing the mind, body, and spirit as well as helping you to slow down and center yourself. Agate transforms negative energy into positive energy.  It enhances mental function, improves concentration,  perception and analytical abilities.