Where to Find Arsenopyrite in the United States
25 mapped arsenopyrite spots across 12 U.S. states. Arsenopyrite is reported at multiple rockhounding spots across the United States. The map below shows where collectors most often find it on legal public ground.
Map showing where to find arsenopyrite across the United States, with 25 mapped spots
Top states for arsenopyrite
States ranked by number of arsenopyrite spots in our database. States in bold link to a focused arsenopyrite-in-state list.
Every arsenopyrite spot we track
Sorted by state and county. Coordinates open in Google Maps.
Arsenopyrite rockhounding FAQ
Where is the best place to find arsenopyrite in the U.S.?+
Idaho, Maine, Montana have the highest concentrations of arsenopyrite in this list. Each state's quality and access varies — open the linked state pages for a detailed view.
How many arsenopyrite rockhounding spots does RockHoundR track?+
25 mapped spots across 12 states. The app keeps these on a map alongside your private finds.
Can I legally collect arsenopyrite on public land?+
Casual hand collecting of common rocks and minerals like arsenopyrite 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 arsenopyrite in the field?+
Field identification of arsenopyrite 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 arsenopyrite on the map
Open RockHoundR to see these spots on a real map with public land overlays and trip-planning details.
