Inesite, Kalahari manganese field, 4cm. Photo: Bruce Cairncross

Quartz with red hematite and blue copper silicate inclusions, Messina mine, 6cm. Photo: Bruce Cairncross

102 carats of alluvial diamonds, Barkly West. Photo: Bruce Cairncross

Aegirine and K-feldspar, 3cm. Photo: Bruce Cairncross

Gold, Barberton, 3cm. Photo: Bruce Cairncross

Galena on dolomite, 4cm. Photo: Bruce Cairncross