Agate occurs in infinite variety and is a favorite material among lapidaries. Its fluid forms lend themselves to attractive cabochons and similar flat or rounded jewelry formats.
This stone, magnified several times, displays cracks that extend only a few millimeters from the surface. They are completely healed and do not affect the stone's strength. For a larger specimen, see the agatized tree-trunk in the Fossil Wood Gallery.
For deep geologic information on agates, including hundreds of pictures, visit the Agate Resources page from the University of Nebraska. Agate is the state rock or state gemstone of Florida, Kentucky, Louisiana, Maryland, Minnesota, Montana, Nebraska and North Dakota.