Pointed out today by Tim Shell on the UFO UpDates list, from Sol 37. Just over a
third of the way down from the top of the image, on the left side but near
middle of image, protruding from a small piece of bedrock. Distinct "stem" and
shadow (best I've seen yet):

http://marsrovers.jpl.nasa.gov/gallery/all/1/p/037/1P131476754EFF0518P2392L7M1.J\
PG

http://tinyurl.com/26grf


There's also an earlier one from Sol 16 I had noticed but was unsure about so
didn't post yet. It is in the patch of otherwise bare soil near the bottom left
corner of the image; this one is sticking out of the soil, not from a piece of
bedrock (or maybe buried bedrock perhaps).

http://marsrovers.jpl.nasa.gov/gallery/all/1/p/016/1P129617432EFF0322P2260L7M1.J\
PG

http://tinyurl.com/2sqkm


And another spherule sliced by the rover that seemed to have a possible
protruding extension too (the upper right spherule):

http://marsrovers.jpl.nasa.gov/gallery/all/1/m/034/1M131212783EFF0500P2959M2M1.J\
PG

http://tinyurl.com/352ny


I'll post some enlargements of these as soon as I can.