Introduction: jamesonite tends to occur in low-temperature Pb-Sb-(Au) assemblages in veins and stockworks. It is one of a number of sulphosalt minerals that are so similar in colour (metallic dark grey), habit (capillary crystals) and mineralogical association (stibnite-dominated assemblages) that confident identification in hand specimen is a risky business. Analytical confirmation (and particularly X-ray diffraction and electron microprobe analysis) is the only safe identification method with such minerals.

Occurrence in Wales: antimony-rich mineralization is uncommon in Wales, but one small mine at Bwlch, near to Conwy in North Wales worked stibnite-dominated antimony ore. Jamesonite was tentatively identified at the mine by Russell (1944) and later confirmed by Bevins et al. (1988).

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