Hi Friends, here's another closeup by Opportunity, one of the more recent views by the microscopic imager. You'll see this time and again in pictures of "blueberries": They are roughly symmetrical, with a sort of point at top and seams running down the sides. Sometimes they are elongated. You can see what I'm talking about a bit more clearly if you use your photo manipulation software to darken the image and increase contrast. Frequently these things are on stalks, possibly due to material weathering away under them but maybe the stalks are part of a growth cycle. Sometimes the stalks are quite dramatic. Anyway, I am not giving up on the idea that they could be strange lifeforms, that are difficult to recognize as life becuase they're so alien. The closest I can come to an Earth analogue is fungus, like mushrooms, or plants like succulents. Sometimes they remind me of primitive animal life like echinoderms (sand dollars are the remains of echinoderms). Here are views of living sand dollars. http://www.seashells.org/identcatagories/naturalsand.htm Anyway, take a glance at this interesting image from Opportunity: http://marsrovers.jpl.nasa.gov/gallery/all/1/m/039/1M131648550EFF0544P2953M2... Best wishes, Joe