 Iron stained Navajo Sandstone near Knab UT |
 Beach pebbles, Lake McDonald Glacier National Park UT |
 Photomicrograph of peridotite in thin section X10 |
 Iron oxide stain in Navajo Sandstone, Coyote Buttes, AZ |
 Photomicrograph of biotite schist in thin section X10 |
 Iron stained Navajo Sandstone near Kanab, UT |
 Banded iron formation with tiger-eye, Mount Brockman, Australia |
 Banded iron formation Ispheming MI |
 Blue quartz rhyolite porphyry, Llano TX |
 Agate, Brazil |
 Petrified wood, Chinle Wash, AZ |
 Rhodochrosite stalactite cross-section, Catamarca, Argentina |
 Polished slab of petrified wood, Holbrook, AZ |
 Agate, Brazil |
 Amethyst-agate geode, Brazil |
 Pyrite suns, Sparta, IL |
 Irridescent specular hematite, Minas Gerais, Brazil |
 Bornite (peacock ore), Butte MT |
 Thunderegg from the Priday layer, Richardson Ranch, OR |
 Petrified wood, Petrified Forest National Park, AZ |
 Petrified Wood, Petrified Forest National Park, AZ |