Dark patterns on a beach in shallow waters that are a classic example of heavy mineral sorting (often called a "placer" formation). Gradient Effect: One can clearly see the "tail" of the sorting process, where the black mineral density decreases, creating a dusty or shadowed effect over the golden sand. Micro-relief: The lighter sand patches appear slightly raised or pillowy (like small dunes), while the darker heavy minerals settle into the troughs and lower edges, outlining the relief. Sestroretsk near St.Petersburg, Russia

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