Where to Find Common Opal
17 mapped common opal spots across 8 regions. Pick a region for its local guide, or browse every spot by country below. Common Opal is reported at multiple rockhounding spots across the United States. The map below shows where collectors most often find it on legal public ground.
Top regions for common opal
United States
17 spots · 8 regionsMap showing where to find common opal, with 17 mapped spots
Every mapped common opal spot
Common Opal rockhounding FAQ
Where is the best place to find common opal?+
New Jersey, Nevada, North Carolina have the highest concentrations of common opal in this list. Quality and access vary by area, so open the linked region pages for a detailed view.
How many common opal rockhounding spots does RockHoundR track?+
17 mapped spots across 8 regions. The app keeps these on a map alongside your private finds.
Can I legally collect common opal on public land?+
In the U.S., casual hand collecting of common rocks and minerals like common opal 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 common opal in the field?+
Field identification of common opal 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 common opal on the map
Open RockHoundR to see these spots on a real map with public land overlays and trip-planning details.
