NASA's Mars Global Surveyor shows a portion of a dark sand dune field in a crater in the Noachis Terra region. Martian dunes are darker than their typical terrestrial counterparts as they contain minerals with a higher abundance of iron and magnesium.

2 January 2006
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a portion of a dark sand dune field in a crater in the Noachis Terra region. Martian dunes are darker than their typical terrestrial counterparts because they contain minerals with a higher abundance of iron and magnesium, and somewhat lower amounts of silica.

Location near: 45.4°S, 331.1°W
Image width: ~3 km (~1.9 mi)
Illumination from: upper left
Season: Southern Spring

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