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Одноязычные примеры (не проверены редакцией PONS)
When the water is however allowed to seep into mines it is oxidised and polluted by the exposed iron pyrites.
en.wikipedia.org Iron pyrites in the silty shale are symptoms of an anoxic environment.
en.wikipedia.org However, some of the concrete surfaces which are today painted were originally unpainted as they suffered early on from staining and streaking from iron pyrites in the aggregate.
en.wikipedia.org It contains a thin irregular layer of sandstone rich in the mineral iron pyrites (fool's gold) and pieces of a bone bed containing bone and teeth of fish and reptiles.
en.wikipedia.org Separating the silver, lead and zinc was further helped by an accidental addition of kerosene and linseed oil which naturally precipitated iron pyrites.
en.wikipedia.org