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Sol 28 ~ 12:11:37 Mars Time  >  El Capitan  >  Vugs

Image Source: NASA / JPL / Cornell
Anaglyph: David Neufer

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    Vugs
Pictures from the rover's panoramic camera and microscopic imager reveal the target rock, dubbed "El Capitan," is thoroughly pocked with indentations about a centimeter (0.4 inch) long and one-fourth or less that wide, with apparently random orientations. This distinctive texture is familiar to geologists as the sites where crystals of salt minerals form within rocks that sit in briny water. When the crystals later disappear, either by erosion or by dissolving in less-salty water, the voids left behind are called vugs, and in this case they conform to the geometry of possible former evaporite minerals.

From NASA/JPL - Press Release