Where to Find Moss Agate in the United States
39 mapped moss agate spots across 12 U.S. states. Moss agate is translucent chalcedony with mineral inclusions that look like ferns or moss. Major U.S. localities include Yellowstone moss agate from Montana and the Mojave deposits in California.
Map showing where to find moss agate across the United States, with 39 mapped spots
Top states for moss agate
States ranked by number of moss agate spots in our database. States in bold link to a focused moss agate-in-state list.
Every moss agate spot we track
Sorted by state and county. Coordinates open in Google Maps.
Moss Agate rockhounding FAQ
Where is the best place to find moss agate in the U.S.?+
Kansas, Wyoming, Iowa have the highest concentrations of moss agate in this list. Each state's quality and access varies — open the linked state pages for a detailed view.
How many moss agate rockhounding spots does RockHoundR track?+
39 mapped spots across 12 states. The app keeps these on a map alongside your private finds.
Can I legally collect moss agate on public land?+
Casual hand collecting of common rocks and minerals like moss agate is allowed on most BLM and U.S. Forest Service land, with daily and annual limits set by the local field office. National parks, most state parks, and tribal land are off-limits. Always check with the managing agency before a trip.
How do I identify moss agate in the field?+
Field identification of moss agate comes down to color, hardness, fracture, and luster. The RockHoundR app links to geology details for each spot to help narrow down what you might be picking up.
Hunt moss agate on the map
Open RockHoundR to see these spots on a real map with public land overlays and trip-planning details.
