Macro photograph of the detail in a piece of Birds Eye rhyolite; a rock of volcanic origin Image #2369 4800 X 3200 pixels
Macro photograph of a slab of fluorite (calcium fluoride) from the Jiangxi Province in China Image #2509 5906 X 4912 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 #2288 4700 X 2989 pixels
