Pendant with geosmin in 1.2 mm silver wire with O atom as red enameled silver ball.

Geosmin is a molecule produced by the Streptomyces. Geosmin has a characteristic smell of moist soil that occurs when raindrops fall on dry ground. The human nose is extremely sensitive to geosmin and we can detect it in very low concentrations. It is also geosmin that gives beetroots their characteristic earthy taste.