Approximate location — plotted from published sources, not a site visit, and not a guarantee of access.
Public BLM Sonoran Desert slopes west of Phoenix near Tonopah where rockhounds hunt fire agate, chalcedony roses, and quartz among volcanic float. A long-standing Gem Trails / rockhounding guidebook locality with dispersed camping and a summit hike; gem-quality fire agate is scarce after decades of collecting, so patience and ethics matter.