Where to Find Onyx in the United States
14 mapped onyx spots across 7 U.S. states. Onyx 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 onyx across the United States, with 14 mapped spots
Top states for onyx
States ranked by number of onyx spots in our database. States in bold link to a focused onyx-in-state list.
Every onyx spot we track
Sorted by state and county. Coordinates open in Google Maps.
Onyx rockhounding FAQ
Where is the best place to find onyx in the U.S.?+
New Mexico, Utah, Montana have the highest concentrations of onyx in this list. Each state's quality and access varies — open the linked state pages for a detailed view.
How many onyx rockhounding spots does RockHoundR track?+
14 mapped spots across 7 states. The app keeps these on a map alongside your private finds.
Can I legally collect onyx on public land?+
Casual hand collecting of common rocks and minerals like onyx 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 onyx in the field?+
Field identification of onyx 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 onyx on the map
Open RockHoundR to see these spots on a real map with public land overlays and trip-planning details.
