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Dirty Pete
Still looks like chert/flint from where I'm sitting, micro/cryptocrystalline, curved fracture (conchoidal), white patina, assume its very hard.

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This appears to be flint.
Flint often formed within and / or around burrows. This may be a portion of burrow.
On the other hand, it may be an area where the flint has re-crystallised to form the shape seen.
Very difficult to determine from the photo alone. 
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Did you not see my reply t your other post?
Colin Huller
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