Good find - that object looks very interesting.
I'm not a geologist by any stretch of the imagination but the object really does look symetrical and concentric, doesn't it - it's a shame there's
no sense of scale that is obvious in the picture. It looks like a broken amulet (perhaps, depending on it's size??) but I've really no idea if this
sort of "artifact" occurs "naturally" on Earth (let alone the different conditions, etc, on Mars). Perhaps a Exo-geologist could give a possible