Macrophotograph of a cross-sectioned and polished malachite stalactite from the Democratic Republic of the Congo. Malachite is a copper based mineral. Image #4105 6100 X 4080 pixels
Macro photograph of the agate and quartz structural detail in a Baker Ranch thunderegg from New Mexico Image #4161 6075 X 4912 pixels (8.84 MB)
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 #4156 4080 X 6144 pixels (8.03 MB)
