Macro photograph of the linear pattern in a cross-sectioned carnelian geode; carnelian is a variety of chalcedony, which is a variety of quartz; from Washington State Image #2894 3132 X 4515 pixels
Macrophotograph of a slab of the gemstone Lapis lazuli; consists largely of lazurite (blue) with specks of pyrite (golden) Image #3861 4800 X 3200 pixels
