NASA Mars Rover Finds Mineral Vein Deposited by Water – NASA Jet Propulsion Laboratory

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NASA’s Mars Exploration Rover Opportunity has found bright veins of a mineral, apparently gypsum, deposited by water.

http://www.jpl.nasa.gov/news/news.cfm?release=2011-377&cid=release_2011-377&msource=11377&tr=y&auid=9976954