This is a strange one -- never seen anything like it before. Does anybody recognize it? It was lying on the pebble beach at Abermawr, having obviously dropped out of the Irish Sea Till exposed in the cliff. Anglesey? Isle of Man? Lake District? Scotland? Definitely not Pembrokeshire......
It's very smooth and silky to the touch -- highly silicified? The subtle colouring and sirface texture reminds me of some of the glassy rhyolites found in N Pembs -- but those big brecciated fragments make me thing it might be an ignimbrite or something on those lines....
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