Which mineral makes up the vast, glittering white dunes of White Sands National Park in southern New Mexico?
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Unlike most desert dunes made of quartz, White Sands consists of pure gypsum sand. Because gypsum dissolves in water, it rarely forms sand, but the area's enclosed basin traps the mineral, creating the world's largest gypsum dunefield. Photo: uncredited National Park Service employee, Wikimedia Commons, Public domain.
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Source: Wikipedia (CC BY-SA)
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