Introduction:

cotunnite occurs as a volcanic sublimate and as an alteration product of galena under saline conditions.

Occurrence in Wales:

cotunnite has been described (Hubbard & Green, 2005) within weathered galena-rich veinstone from the phosgenite locality at Penrhyn Du on the Llŷn. It was found as bladed microcrystals in material collected in situ from a vein exposed below the High Water mark. It is likely that a reaction between chlorine in the seawater and lead within galena in the veinstone has produced this rare mineral.

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