Strong angular backlighting emphasizes the concentric structure patterns this Montana agate Image #2698 4558 X 3200 pixels
Macrophotograph of a cut and polished piece of Willow Creek jasper from Idaho Image #3894 4800 X 3200 pixels
Macro photograph of an agate from Brazil that has been sliced and polished. Agate is a form of quartz known as chalcedony. Image #2295 3200 X 4800 pixels
