RockHoundR

Where to Find Opal

57 mapped opal spots across 23 regions in 3 countries. Pick a region for its local guide, or browse every spot below. Opal forms when silica-rich water dries out in cavities. Common opal is widely scattered; precious opal is concentrated in Nevada (Virgin Valley), Oregon (Opal Butte), and Idaho (Spencer).

Open the full map

Every mapped opal spot

Top regions for opal

Australia

5 spots · 2 regions

Opal rockhounding FAQ

Where is the best place to find opal?+
Utah, Idaho, Nevada have the highest concentrations of opal in this list. Quality and access vary by area, so open the linked region pages for a detailed view.
How many opal rockhounding spots does RockHoundR track?+
57 mapped spots across 23 regions in 3 countries. The app keeps these on a map alongside your private finds.
Can I legally collect opal on public land?+
In the U.S., casual hand collecting of common rocks and minerals like 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 opal in the field?+
Field identification of 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 opal 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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