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
Macrophotograph of Peacock ore (Chalcopyrite treated with acid) from Mexico; a copper ore Image #3047 3102 X 4747 pixels
