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Small, pinkish sand dune at Coral Pink Sand Dunes State Park, Utah below some shrubs, with greenish hills in the left distance, under a partly cloudy sky. The surface of the dune appears pitted, likely a combination of wind-weathered human footprints, wind ripples, and small sand avalanches where the sand was pulled downslope by gravity. The dunes are pinkish because they are comprised of clear quartz sand grains that have a thin coating of rust-colored hematite. The grains are weathering from adjacent outcrops of Lower Jurassic (~180 million year old) Navajo Sandstone, itself made of (much larger) sand dunes from a long-gone desert...in other words, this dune is made of sand from ancient sand dunes.