Agate is found throughout the world. In the United States it is produced in several western states; Oregon, Washington, Idaho, and Montana are the chief sources of gemstones. Most agates occur in cavities in eruptive rocks or ancient lavas.

Where is the best place to find agates?

Agates can be found on the beaches of oceans and lakes, along road cuts, and in areas with exposed gravel. In the U.S., agates are most commonly found along the shores of the Great Lakes, the beaches of the Pacific Coast, and in the deserts of many western states.

Which state has the most agates?

Agate. Agate is the state gem of Louisiana, Maryland, Minnesota, Montana, Nebraska, and North Dakota. This makes it by far the most popular state gemstone (and ​state rock).