Macrophotograph of quartz crystals and pyrite; from Peru Image #3565 3198 X 4598 pixels (4.97 MB)
Macrophotograph of a slab of the gemstone Lapis lazuli; consists largely of lazurite (blue) with specks of pyrite (golden) Image #3863 3158 X 4737 pixels
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
