Macro photograph of linear patterns in a piece of Wonderstone rhyolite; an igneous rock formed as magma cools Image #2709 4682 X 3148 pixels
Macro photograph of the detail in a piece of Birds Eye rhyolite; a rock of volcanic origin Image #2849 3200 X 4693 pixels
Macro photograph of linear patterns in a Whitcomb Creek geode from Oregon; a geode is a stone nodule with an inner cavity filled with crystals or mineral matter Image #3286 4800 X 3200 pixels
