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Each page contains a photo gallery (high resolution) to provide examples of the type and help solidify concepts. Fortification Agates Water Line Agates Agates in Petrified Wood Thunderegg Agates Additional Learning The Quartz Page-fantastic and detailed discussion of the formation of agates.
Agate is a translucent variety of microcrystalline quartz. It is used as a semiprecious stone when it is of desirable quality and color. Agate generally forms by the deposition of silica from groundwater in the cavities of igneous rocks. The agate deposits in concentric layers around the walls of the cavity, or in horizontal layers building up from the bottom of the cavity.