http://www.cnn.com/2014/01/20/tech/innovation/mars-mystery-rock/
snip:
The most likely scenario is that Opportunity flicked the rock with one of its wheels.
"We had driven a meter or two away from here, and somehow maybe one of the wheels, kind of, managed to spit it out of the ground, and have it slide to this position," Squyres said.
Alternatively, there could be a smoking hole in the ground nearby and the rock could be a piece of crater ejecta, or piece of matter spewn from the impact of a meteorite. Squyres doesn't think this is as likely as the idea that the rover displaced the rock, however.
Opportunity is now studying the mystery rock more extensively, making measurements and taking pictures. Its instruments have shown scientists that the "jelly" part is "like nothing we've ever seen before," Squyres said. It's very high in sulfur and magnesium, and it has twice as much manganese as has ever been seen in anything on Mars.
No one knows what that means.
"We're completely confused, we're having a wonderful time, everyone on the team is arguing and fighting," Squyres said.
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