Very small crystals of cumengéite, atacamite and botallackite occur in fractures of brecciated siltstone containing quartz-chalcopyrite-bornite veins on the beach between Abersoch and Penrhyn Du.
Ref.:
Dossett, I. & Green, D.I., 1998. Atacamite, botallackite and cumengeite from Abersoch, Gwynedd, Wales. Journal of the Russell Society 7(1), 37-38.
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UK OS Grid Reference: SH316270
Map Reference: 52°48'49"N , 4°29'56"W
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