George wrote:
It's just a weathered spherule (a concretion).

Top or bottom. I don't think the bottom one is even a spherule. If you
look at the other images the matrix is full of these "blocky" structures
that are not apparently related to the spherules. The structures form a
sort of "braided" pattern, often concentric around a void. I think this
is just another example of one of those. Interesting, but not a
spherule cut in half as one might think at first glance.


--
Greg Crinklaw
Astronomical Software Developer
Cloudcroft, New Mexico, USA (33N, 106W, 2700m)

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