brachiopod shell or something else?

[1bear]

Hi there
I need a little bit of help with this one
I think it might be fossil of brachiopod, but not sure for 100%, any suggestions?
Location-Scotland
Thanks

 

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[Harry Pristis]

Not brachiopod . . . I suggest stromatolite.

 

[old digger]

That rock would look awesome if you polished it.