The note of Silex, often a masterful abstraction rather than a direct extraction, presents itself as an olfactory impression of flint stone. It is predominantly mineralic, cold, and dry, carrying an initial sharpness reminiscent of metal striking stone, a fleeting spark. This initial effervescence settles into a profound, almost austere stoniness; imagine the scent of ancient, dry rock, sun-baked and then suddenly cooled by a passing cloud. There's a subtle, almost chalky or dusty quality beneath the initial impact, grounding it. It is entirely non-floral, non-gourmand, and non-animalic, existing in a realm of pure, unadorned texture. Its projection is often moderate but persistent, creating an ethereal aura rather than a dense cloud. Longevity is typically excellent, as the accord often comprises stable, heavier molecules, allowing it to behave as a captivating heart or even a tenacious base note, lending a unique 'architectural' backbone to a composition.