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Mineralogy of Mawrth Vallis CRISM image overlaid atop MOLA data of Mawrth Vallis. This covers an area about 10 kilometers (6.2 miles) wide. Fe/Mg-phyllosilicate is shown in red, Al-phyllosilicate is shown in blue, hydrated silica and an Fe2+ phase are shown in yellow/green. NASA / JPL-Caltech / JHUAPL / MSSS / SETI