Simonellite (1,1-dimethyl-1,2,3,4-tetrahydro-7-isopropyl phenanthrene) is a polycyclic aromatic hydrocarbon with a chemical formula C19H24.

Simonellite occurs naturally as an organic mineral derived from diterpenes present in conifer resins.

[1] It is named after its discoverer, Vittorio Simonelli (1860–1929), an Italian geologist.

Simonellite, together with cadalene, retene and ip-iHMN, is a biomarker of higher plants, which makes it useful for paleobotanic analysis of rock sediments.

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