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I would be very interested to know what this geometric pattern is. If my memory serves me correctly I found it on the west coast of Skye. I was looking for dinosaur foot prints at the time and the regularity of the sharp lines in the pattern caught my eye. Perhaps it is not a fossil at all,  just the way some rock has cooled. What do I know? - nothing, which is why I am asking.
Thanks in advance if anyone would care to take the time to answer.  Click image for larger version - Name: IMG_1751.jpg, Views: 43, Size: 711.20 KB
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Hello; these look like pseudomorphs: the original (marcasite?) crystals are dissolved and the cavity filled with another mineral.

greets, Bert
the search is as valuable as the finds...
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Dirty Pete
I'd suggest some kind of intrusive igneous, maybe pegmatite, slow cooling of the melt has allowed large crystals to form and align themselves, might be some twinning going on as well........I'm pretty sure it's not a fossil.

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Thanks Pete and Bert for your replies. I will keep it with my collection as it interests me.
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