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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.
The first deposit on the wall of a cavity, forming the skin of the agate, is generally a dark greenish mineral substance, like celadonite, delessite or  green earth , which are rich in iron probably derived from the decomposition of the augite in the enclosing volcanic rock.endritic agates have fern like patterns in them formed due to the presence of manganese and iron oxides. Other types of included matter deposited during agate-building include sagenitic growths (radial mineral crystals) and chunks of entrapped detritus (such as sand, ash, or mud).