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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.
A hard stone, usually within the range of 7-9 on the Mohs scale agates are found in all colors of the rainbow, although green and blue are quite rare. Agate is a variety of chalcedony formed from layers of quartz which usually show varicolored bands. It usually occurs as rounded nodules or veins. Often tiny quartz crystals form within the stone and add to the beauty and uniqueness of individual stones. These crystals are called drusy (sometimes misspelled as druzy).