Inesite, Kalahari manganese field, 4cm. (Photograph courtesy Dr Bruce Cairncross)
Quartz with red hematite and blue copper silicate inclusions, Messina mine, 6cm. (Photograph courtesy Dr Bruce Cairncross)
102 carats of alluvial diamonds, Barkly West. (Photograph courtesy Dr Bruce Cairncross)
Aegirine and K-feldspar, 3cm. (Photograph courtesy Dr Bruce Cairncross)
Gold, Barberton, 3cm. (Photograph courtesy Dr Bruce Cairncross)
Galena on dolomite, 4cm. (Photograph courtesy Dr Bruce Cairncross)