Limestone is typically found in warm, shallow water areas and is usually a shade of tan or bluish gray. Volcanic ash beds are formed from the eruption of a volcano. California, Utah, Nevada, Iowa, and Arizona are all known for their geodes, but you can find geodes in most other states as well. [2] X Research source Your rockhounding experience will really depend on what part of the country you’re in—for instance, searching for geodes in the northeastern US will be a lot different than looking for geodes in the southwest. [3] X Expert Source Sam Lagor, MScGeologist Expert Interview. 7 October 2021. Uruguay, Brazil, and Mexico are also known for having geodes, and Madagascar has a specific type called the celestite geode.

There are hundreds of gem and mineral clubs, such as Four Corners Gem and Mineral Club, San Francisco Gem and Mineral Society, and Tucson Gem and Mineral Society. Go online to find a gem and mineral club near you. Their website will have all of the information needed to join. A lot of rockhounding locations end up being on private property. Double-check that you have the rights to be on that land before you head over. [6] X Expert Source Sam Lagor, MScGeologist Expert Interview. 7 October 2021.

Many of these sites cost money and require a bucket and proper clothing — such as boots, gloves, or even goggles — so call ahead or check online to find out the details regarding the specific collecting site. You may also need to bring along chisels, sledgehammers, sturdy gloves, and a backpack to carry everything. [8] X Expert Source Sam Lagor, MScGeologist Expert Interview. 7 October 2021.

Geodes tend to resemble cauliflower in texture.

Geodes can range in size from the size of a pea to a basketball, and possibly even larger.

If you’re searching an ash bed, limestone area, or especially a riverbed, use a shovel to lightly scrape the sediment around. The water might have caused sediment to cover the geodes or they could be hidden under the ash. If you’re at a geode collecting site or on a field trip with a gem and mineral club, bring a shovel. Your guide may be able to point out spots where you can dig a little to find more geodes.

Pipe cutters have a chain that you can wrap around the geode to keep it in place while you work.