Agate is a form of chalcedony characterized by bands or zones which differ in color. Agate forms in geodes within volcanic rock, cavity linings, veins and replacive masses in a variety of rocks. Example: Druzy-Conchos (common name) sparkles like glittering quartz crystals that form on the surface of other stones. Ground water that carries silica is forced into porous areas of rock, causing rapid cooling that creates the formation of crystals in cavities or on surfaces of small rocks.
* Scientific proof may not be available to substantiate these claims.