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Amgueddfa Cymru – Museum Wales
Lump of fresh ophitic dolerite. Roughly oval but with one relatively pointed end and a flattened butt at the other. Broad, deep, channel cut across one broad face and the sides about a third in frrom the butt end. On the other face the line is continued by a relatively narrow and shallow groove.
Site Name: Mynachlog-ddu, Pembrokeshire
