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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 the banded form of the mineral Chalcedony, which is a microcrystalline variety of Quartz. Agate is the most varied and popular type of Chalcedony, having many varieties on its own.rystal Forms and Aggregates. Agate is a banded microcrystalline form of the mineral Quartz, and does not occur in visible crystals. It occurs in nodules, in massive form, as botryoidal, mammilary, and stalactitic formations, as smooth rounded pebbles, as amygdules, and as the linings of geodes.