Agates are a variety of the mineral chalcedony. They are primarily formed within volcanic and metamorphic rocks where silica-rich fluids from volcanic material deposits on the walls of cavities (voids) within the rock. Chalcedony comes in a wide variety of colors, and can be opaque to translucent to completely transparent. Variations in the character of the solution can sometimes cause variation in the layers being deposited, resulting in bands of chalcedony (called banded agates).

Agates are found all over the Earth. Some of the more famous agate deposits are found in Africa, Mexico, Brazil, Italy (Sicily) and the United States (Great Lakes Region of Lake Michigan and Lake Superior, Oregon, Minnesota, Wisconsin and Maryland).

Highlighted in this gallery are some spectacular examples of polished agates containing a multitude of colors and banding in the collection of John and William Fletcher. Many are Leguna Crazy Lace Agates, although a few are also from Chihuahua, Mexico and other locations (labeled). For further photographs of this amazing collection of agates, visit their instagram page at @crystalsofheaven.

John and William Fletcher

Red Banded Agate from New Mexico

Royal Imperial Jasper

Ocean Scene Picture Agate from Colorado

Clear Banded Agate from Chihuahua, Mexico