Found in Pelargonium graveolens, Cymbopogon martinii, Rosa spp.
Appearance
Colorless to pale yellow clear liquid
Producing Countries
China, Egypt, India, Indonesia
Pyramid
Heart
The rose you smell in rose oil is largely geraniol. A monoterpene alcohol that is sweet, clean, and floral — less jammy than phenylethyl alcohol, less green than citronellol — the molecular baseline of what "rosy" means.
Sweet, clean, unmistakably rosy with a waxy-citrus underside. Less heavy than phenylethyl alcohol (the other "rose" molecule), less green and herbal than citronellol. The initial impression is bright and transparent — a rose stripped to its geometric skeleton. In the dry-down, a faint lemongrass-like citrus appears, a reminder of geraniol's presence in grass oils.
Evolution over time
Immediately
Immediately
Bright, sweet, distinctly rosy. Clean and transparent with a citrus flash.
After a few hours
After a few hours
The sweetness softens. A waxy, slightly citrus-lemongrass undertone emerges. Still recognizably rosy.
After a few days
After a few days
Faint, sweet-floral residue. Moderate tenacity — geraniol fades within 4-6 hours on skin without fixative support.
The Full Story
Geraniol ((2E)-3,7-dimethylocta-2,6-dien-1-ol, CAS 106-24-1) is a naturally occurring monoterpenoid alcohol with the molecular formula C10H18O. It has been identified in over 160 essential oils. Palmarosa oil (Cymbopogon martinii) contains the highest concentration — 70 to 85% — making it the primary commercial source. Rose oil, geranium oil, citronella oil, and lemongrass oil also contain significant quantities.
The scent is sweet, rosy-floral, with a subtle citrus undercurrent and a faintly waxy quality. It is cleaner and more transparent than rose absolute, lacking the honey and spice qualities of the full flower. Compared to its isomer nerol, geraniol is sweeter and less sharp. Compared to citronellol — its hydrogenation product — geraniol is more distinctly rose-like, with better diffusion.
Industrially, geraniol is also produced by selective hydrogenation of citral (an intermediate in vitamin A synthesis) or by chemical synthesis. Both natural and synthetic grades are used interchangeably in perfumery. It does not discolor soaps, which makes it particularly valuable for functional fragrance applications.
Geraniol is a chemical building block for other fragrance materials: geranyl acetate (fruity-rosy), citronellol (soft rose), and linalool share overlapping terpene pathways. The molecule is classified as an IFRA-listed allergen and must be declared on product labels above certain thresholds (0.001% in leave-on products, 0.01% in rinse-off).
Geraniol is one of nature's most effective insect repellents — the EPA has registered it as a biopesticide since 1960. Plants produce it partly as a chemical defense against herbivorous insects, which means the molecule humans find most "rose-like" evolved as a toxin.
Extraction & Chemistry
Extraction method: Natural geraniol is isolated from palmarosa essential oil (Cymbopogon martinii, 70-85% geraniol content) via fractional distillation. Also found in rose otto (15-22%), geranium oil (15-25%), and citronella oil (20-40%). Synthetic geraniol is produced by selective hydrogenation of citral, itself derived from beta-pinene or isoprene. Both natural and synthetic grades are used in perfumery.
Molecular Formula
C10H18O
CAS Number
106-24-1
Botanical Name
Found in Pelargonium graveolens, Cymbopogon martinii, Rosa spp.
Geraniol is one of perfumery's foundational rose building blocks. It is indispensable in rose accords, peony reconstructions, and magnolia bases, where it provides the clean, sweet-floral spine. It functions as a heart note with moderate tenacity, blending smooth with citronellol, phenylethyl alcohol, and rose oxide to create convincing rose effects. Beyond florals, geraniol adds rosy sweetness to chypre and fougere bases. It is also used as a chemical intermediate to produce geranyl acetate and other esters. The molecule is stable in alkaline media, making it one of the few floral materials that performs reliably in soap formulations.
