RockHoundR

Where to Find Arsenopyrite

30 mapped arsenopyrite spots across 18 regions in 2 countries. Pick a region for its local guide, or browse every spot below. 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.

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Every mapped arsenopyrite spot

Top regions for arsenopyrite

United Kingdom

6 spots · 3 regions

Arsenopyrite rockhounding FAQ

Where is the best place to find arsenopyrite?+
Idaho, Montana, South Dakota have the highest concentrations of arsenopyrite in this list. Quality and access vary by area, so open the linked region pages for a detailed view.
How many arsenopyrite rockhounding spots does RockHoundR track?+
30 mapped spots across 18 regions in 2 countries. The app keeps these on a map alongside your private finds.
Can I legally collect arsenopyrite on public land?+
In the U.S., 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. Rules differ by country and region, so 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.

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