This image of an outcrop at the “Sheepbed” locality, taken by NASA's Curiosity Mars rover with its right MastCam on December 13, show well-defined veins filled with whitish minerals, interpreted as calcium sulfate. These veins form when water circulates through fractures, depositing minerals along the sides of the fracture, to form a vein. This is Curiosity's first close look at minerals that formed within water that percolated within a subsurface environment. (Photo by NASA)
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