Where to Find Marcasite in the United States
61 mapped marcasite spots across 12 U.S. states. Marcasite 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 marcasite across the United States, with 61 mapped spots
Top states for marcasite
States ranked by number of marcasite spots in our database. States in bold link to a focused marcasite-in-state list.
Every marcasite spot we track
Sorted by state and county. Coordinates open in Google Maps.
Marcasite rockhounding FAQ
Where is the best place to find marcasite in the U.S.?+
Missouri, Indiana, Wisconsin have the highest concentrations of marcasite in this list. Each state's quality and access varies — open the linked state pages for a detailed view.
How many marcasite rockhounding spots does RockHoundR track?+
61 mapped spots across 12 states. The app keeps these on a map alongside your private finds.
Can I legally collect marcasite on public land?+
Casual hand collecting of common rocks and minerals like marcasite 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 marcasite in the field?+
Field identification of marcasite 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 marcasite on the map
Open RockHoundR to see these spots on a real map with public land overlays and trip-planning details.
