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)
Macro photograph of the silvery blue bladed structure of the mineral kyanite, an aluminum silicate. From Brazil Image #2584 4748 X 3117 pixels
