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Credit: NASA/JPL/Cornell/USGS/UNR

These views of martian "blueberries" at Meridiani Planum are from Opportunity's Microscopic Imager. The photos are courtesy of scientists Wendy Calvin from the University of Nevada at Reno and Ken Herkenhoff from the U.S. Geological Survey in Flagstaff, AZ. Blueberries have been prevalent throughout Opportunity's travels at Meridiani Planum. They are thought to be hematite concretions. Concretions are spherical structures that form when minerals are precipitated from groundwater. The presence of blueberries at "Eagle Crater" helped to support the idea that the rock outcrop was once soaked in liquid water.