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I found this washed up on the Atlantic ocean. Can anybody tell me what this might be?
Looks to be a sedimentary concretion of some sort, with various modern encrustations.
As with many concretions, it may have a fossil within.
It would be useful to know its density - might give a clue as to rock type (or could suggest it is an indurated nut, perhaps).
Can't say much more without thin-sectioning and examination under microscope.