At l'Île d'Or (Golden Island) in Saint-Raphaël, the contrast between the red color of the rhyolite islet and the blue color of the esterellite pebbles of Dramont beach, barely visible in the background, is striking. This blue porphyry, less widespread and more discreet chromatically than the rhyolite of the Estérel, is highly resistant. Still quarried nowadays, it was already known to the Romans and has long been used for road construction and as railroad ballast.