Where to Find Opal in New Jersey
New Jersey has 3 mapped collecting spots that report opal, spread across 2 counties. The largest share sits in Passaic County with 2 spots. 3 of the spots are on land mapped as publicly accessible.
Every opal spot we track in New Jersey
Best counties for opal in New Jersey
Ranked by the number of mapped opal spots. County links open the full rockhounding page for that county.
Before you go
Read the opal identification guide so you know what a keeper looks like in the field: Opal in the encyclopedia.
Opal in New Jersey FAQ
Where can you find opal in New Jersey?+
The mapped spots concentrate in Passaic County and Somerset County. Every spot on this page is on the map, and each spot's own page has its coordinates and access notes.
How many opal spots are mapped in New Jersey?+
3 spots across 2 counties. The RockHoundR app keeps the same spots on an offline map with public land overlays, geology layers, and your saved finds.
Is it legal to collect opal in New Jersey?+
Hand collecting of common rocks and minerals in small amounts for personal use is generally allowed on BLM and U.S. Forest Service land, with limits set by the local field office. National parks, most state parks, and tribal land are closed to collecting. 3 of the 3 mapped spots here sit on land marked public. Always confirm current rules with the managing agency before you dig.
Where else to find opal
More minerals to hunt in New Jersey
Hunt opal in New Jersey with the map in your pocket
RockHoundR puts these spots on an offline map with BLM and Forest Service overlays, geology layers, and a log for your finds.
