No problem. I think it's a concrete cast, but you could check by ringing the visitor centre:
http://www.heritageireland.ie/en/HistoricSites/East/BrunaBoinneVistorCentreNewgrangeandKnowthMeath/
I like a nice stone basin. Smart.
Wonder if it was a basin shape before it was carved, or if the makers made it concave too, if so, that's a lot of work .
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