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Gypsum crystals at Salar de Pajonales salt flat, Lullaillaco national park altiplano of Chile

File: Pajonales.jpg

Title: Gypsum crystals at Salar de Pajonales salt flat, Lullaillaco national park altiplano of Chile

These crystals formed at a time, when this salt flat was still under a layer of water

Credit: Gerhard Hüdepohl / atacamaphoto