Geosmin, also rendered in Japanese as geosumin or jeosumin, is an organic compound that smells like the ground after rain. Its name comes from the Greek geo (earth) and smin (smell). It was first isolated and named geosmin by Gerber and Lechevalier in 1965.
It is also responsible for musty odors from sewers and the muddy smell of freshwater fish such as carp. This is because it is produced by microorganisms. In perfume, a synthetic fragrance material is used.
A similar fragrance material is petrichor (in Japanese).
What Does It Smell Like in Perfume?
In perfume, geosmin gives a cool, damp, earthy outline reminiscent of wet soil, roots, moss, and the air after rain. Geosmin is a single molecule also produced by soil microorganisms. Because its earthy or musty scent can be perceived at very low concentrations, a slight difference in amount can greatly change the impression. Petrichor, in which green, earthy, and watery elements overlap, is an expression of a complex scent, not the same thing as geosmin on its own.
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