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Amgueddfa Cymru – Museum Wales
Soft, grey, vesicular fabric. Abundant angular cavities formed by weathered out calcite crystals up to 5 mm long. Occasional sherds have the calcite preserved, showing that they were originally rhomboidal cleavage fragments of vein calcite. There is also a scatter of tiny quartz. Probably local provenance.
Site Name: Longbury Bank, Penally