Macro photograph of the detail in a piece of Birds Eye rhyolite; a rock of volcanic origin Image #2848 4734 X 3132 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. 4696 X 3200 pixels (4.96 MB)
Macrophotograph of the colors and patterns in a cut and polished slab of brecciated pink opal. An opalised radiolarite from Western Australia. Radiolarite is a sedimentary rock composed primarily of the microscopic skeletal remains of radiolara protozoa. Image #3849 5803 X 2659 pixels
