In the outcrop of the Aquia Greensand west of Annapolis, Maryland, the weathering of glauconite does not follow the reverse of the normally accepted formation process. Chemical, mineralogical, and morphological data indicate that weathering results in the formation of goethite pseudomorphs after glauconite. The presence of a well-disseminated, white coating composed of kaolinite, and probably a mixed-layered assemblage, suggests that reprecipitation accompanies the pseudomorphic replacement.

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