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Geosmin is an organic compound with a distinct earthy flavor and aroma, and is responsible for the earthy taste of beets and a contributor to the strong scent that occurs in the air when rain falls after a dry spell of weather or when soil is disturbed. it is produced by a variety of microorganisms. chemically, it is a bicyclic alcohol with formula c12h22o, a derivative of decalin. its name is derived from the greek γεω "earth" and ὀσμή "smell".