Macro photograph of a cross-sectioned carnelian geode; carnelian is a variety of chalcedony, which is a variety of quartz; from Washington State Image #2897 3200 X 4800 pixels
Macro photograph of the patterns in a cut and polished piece of Zebra jasper, a variety of chalcedony (cryptocrystalline quartz) from India Image #2364 4458 X 3200 pixels
Macro photograph of a slab of polished Mookaite jasper from the Mooka Creek area of Western Australia. Formed approx. 125 million yrs ago, in part, from the fossilization of microscopic protozoa called radiolaria. Image #3140 3200 X 4707 pixels
