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Comanche outcrop as seen by Spirit

Comanche outcrop as seen by Spirit
Comanche outcrop as seen by Spirit The outcrop of rock named "Comanche" by Spirit's science team turns out to be composed, in part, of an iron-magnesium carbonate, the first massive outcrop of carbonate rock discovered on the surface of Mars. "Algonquin," in the foreground, does not contain carbonate minerals. The two outcrops are separated by about 85 meters. NASA / JPL-Caltech / Cornell