High silica content of Martian soil is yet another indicator of past water on Mars. "The fact that we found something this new and different after nearly 1,200 days on Mars makes it even more remarkable."
Mars Reconnaissance Orbiter recently snapped a picture of the Opportunity rover perched on the rim of Victoria Crater. Opportunity drove more than 5 miles from its landing site to get there. High resolution photo here. Here's where Opportunity is located on Mars.

