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Altnacraig
I'm embarrassed to post this, but I'm wondering if anyone could at least give me guidance as to what this may be. It was found in Surrey near an 18th century gunpowder factory and is 6cms long. It looks as if it's been drilled, although the "tube" isn't straight. Apologies for using a fossil forum for this question but my grandson is convinced it's a fossil. I'm certainly not! Thanks for your help Guildford3.jpg 
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Dirty Pete
I'll go for the silicified central cavity of a cylindrical sponge, the outer walls having dissolved away resulting in the drilled/cored effect....so I'm with your grandson on this one. See what others think...

Pete
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TqB
I agree with Pete that it's a sponge, in flint.
Tarquin
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