This is an image of a polished flat surface of a cut chip of the Egyptian meteorite Nakhla photographed with a scanning electron microscope (SEM). The brightest material is the mineral olivine, a magnesium-iron silicate formed when a lava flow cooled on Mars. At some point, the meteorite was fractured, then soaked in water on Mars. The Martian water precipitated a variety of materials in the cracks.
Photo Credit: NASA
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