I would like to open a discussion on Martian spherules as it seems to me that there is not enough evidence in the images sent back by the Rovers to support the theory that they are concretions of minerals or rock.
Now, I dont know what they are, but it seems to me that there should be places where these things fall out of the rock they formed in - in which case there would be piles of them where they have been formed. If they are dropping out of where they are formed as they get dislodged by the wind etc then we should see rocks full of these concretions (since there are so many spherules lying around on the ground in some areas).
As I say, I dont know what causes them, so please dont ask me. I have a few way-out and whacky ideas but I do not think you want to hear these and they are not appropriate in this forum.
I would like to hear alternative theories or reasons why the current theory for martian spherules is reasonable (ie: show evidence in the images to support the theory).