The gypsum dunes of Cuatro Cienegas, a white desert of 8 Km2 (the second largest in the world), are composed of 98%of calcium sulfate and are the purest on Earth.
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Title: Cuatro Ciénegas gypsum dunes
Creator: Nicolás Sánchez-Mejorada Girault
Location Created: Cuatro Ciénegas de Carranza, Coahuila.