Well, topazguy, I don't know what else to say but thanks for the better pics. Maybe someone else will have an idea.
All I can say is because of the environment you found the pieces in, I can't think of what else it might be. The second paragraph of the link I posted speaks to the metastability of Cristobalite and some of the other polymorphs of quartz. Could be it's just weathering and falling apart like the layers of an onion.
It does seem to be behaving more like a Feldspar, but I'm going to have to stick with the Cristo for now. Cool find and thanks for sharing. Let us know if you find out something else about it. Joe
Thanks again Joe! I really appreciate your help on this one.
I think you are onto it with the metastability of the mineral and the fact that I'm most likely looking at a polymorph of some kind. I will probably leave it at that, but will keep my eyes open and update the thread if anything else turns up.
I will be back in this same area sometime this spring, so I will see if I can turn a few more of these up. I will also pay a little closer attention to any other clues in the area... as I'm afraid I was focused on something else when I initially found these and didn't really give them much thought at the time.