Macrophotograph of the mineral amethyst (Silicon dioxide); a form of quartz that came to be a symbol of celibacy in the Middle Ages; found in Uruguay. Image #2287 3140 X4425 pixels
Macrophotograph of a cut and polished piece of Leopard Skin jasper Image #3899 6144 X 4080 pixels
Macrophotograph of a cross-sectioned and polished malachite stalactite from the Democratic Republic of the Congo. Malachite is a copper based mineral. Image #4105 6100 X 4080 pixels
