Vanadinite crystals (red-orange) on barite; Morocco Image #4002 4800 X 3200 pixels
Macrophotograph of Peacock ore (Chalcopyrite treated with acid) from Mexico; a copper ore Image #3046 4800 X 3200 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 #4154 3939 X 6144 pixels (12.36 MB)
