Fig. 1: Cadmium-rich smithsonite from the Sheshodonnell East mine, Carran, The Burren, county Clare, Munster, Ireland. 6.6x4.3x2.2 cm, 120.55 grams. The sample has a distinctive heft for its size, even allowing for the nominal specific gravity of 4.2 for smithsonite. Cadmium (Cd) is the colouring agent that imparts the spectacular yellow hue. Cadmium may be found at percent levels in sphalerite (ZnS) from some localities, and the smithsonite is possibly a secondary mineral formed from pre-existing zinc sulphide (?). Sample 365, from the collection of Irish minerals of Robert Yeoman, via David and Daniel Joyce (D. Joyce Minerals), 2026.