HiRISE: Raindrops of sand in Copernicus Crater

ESP_031221_1315Raindrops of sand in Copernicus Crater. The dark features here look like raindrops, but are actually sand dunes rich in the mineral olivine. These types of dunes are rare on Earth as olivine rapidly weathers to clays in a wet environment.

HiRISE Picture of the Day archive. [More at links]

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