Introduction: semseyite is found, along with other related lead-antimony sulphosalts, in conjunction with stibnite and galena in complex hydrothermal vein and breccia assemblages typical of the epithermal Pb-Sb association. A feature of this group of minerals is that it is often impossible to identify them in hand specimen and even in polished section they can be remarkably difficult to distinguish. Consequently, verification requires detailed analytical techniques in the majority of occurrences.

Occurrence in Wales: semseyite was first recorded from Wales by Russell (1944), from an isolated occurrence of Pb-Sb mineralization worked at the Bwlch Mine near Deganwy on the North Wales coast. Further, detailed investigation of this mineralization (Bevins et al., 1988) provided analytical details of the occurrence and additionally confirmed the presence of a number of related Pb-Sb sulphosalts.

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