Macrophotograph of a slice of rhodochrosite stalactite; from the Capillitas Mine, Catamarca Province; Argentina; rhodochrosite is a manganese carbonate mineral Image #4140 6144 X 4912 pixels
Macro photograph of a piece of Octahedral pyrite with strong sidelighting to emphasize its texture and angular structure; Quiruvilca Mine, Peru Image #2579 4385 X 2799 pixels
A form of layered chalcedony characterized by parallel banding; chalcedony is a form of (cryptocrystalline) quartz Image #2665 4800 X 3200 pixels
