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Opal Pool, Midway Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Underground mine of the family Bevan in Lightning Ridge, near the Queensland border, opal settlement, New South Wales, Australia

Two older men searching for opals, opal mining fields, Aboriginal Land, Stuart Highway near Marla Opalsiedlung, South Australia

Visitor searching for opals, opal mining fields, Aboriginal Land, Stuart Highway near Marla Opalsiedlung, South Australia

Black Opal Pool, Hot Spring, Yellow Algae and Mineral Deposits, Biscuit Basin, Yellowstone National Park, Wyoming, USA, North America

Dunes, ocean, landscape, coast, Dunes de la Slack, Wimereux, Boulogne sur Mer, Opal coast, Nord Pas de Calais, France, Europe

Black Opal Spring, geyser, Biscuit Basin, Upper Geyser Basin, Yellowstone National Park, Wyoming, United States of America, USA

Girl throwing a plastic waste in a tidal bin on a beach on the Opal Coast, summer, Pas de Calais, France

Alignment of wooden piles planted in the sand to disperse the energy of the swell and favor the return of sediments, winter, Opal Coast, France

GR 120 from Sangatte, also called Sentier du Littoral, it stretches along the Opal Coast, from the Belgian border to Berck-sur-Mer, Hauts de France, France