Macro photograph of the agate and quartz structural detail in a Baker Ranch thunderegg from New Mexico Image #4159 4800 X 3200 pixels (5.1 MB)
Macrophotograph of a cross-sectioned and polished malachite stalactite from the Democratic Republic of the Congo. Malachite is a copper based mineral. Image #4107 4912 X 5227 pixels
Macrophotograph of the structural detail in a pietersite gemstone from Arizona. Also known as 'Arizona tiger eye' it is a variety of chalcedony that contains amphibole mineral fibers that result in a chatoyant (optical reflectance) effect. Image #4155 4668 X 3200 pixels (7.53 MB)
