Rockhounding in Union County, New Jersey
1 mapped rockhounding spot in Union County. Most commonly produces agate, amethyst, prehnite.
Map showing 1 rockhounding spot in Union County, New Jersey
Spots in Union County
| Spot | Minerals | Coordinates | Access |
|---|---|---|---|
| Houdaille QuarryPhillipsburg-Newark Expressway | 40.7100, -74.3348 | Public |
Other rockhounding counties in New Jersey
- Morris County11 spotsTop: Pyrite, Apatite, Chalcopyrite
- Somerset County9 spotsTop: Quartz, Agate, Prehnite
- Sussex County6 spotsTop: Fluorite, Willemite, Corundum
- Gloucester County5 spotsTop: Amber, Fossils
- Hunterdon County5 spotsTop: Axinite, Datolite, Actinolite
- Mercer County5 spotsTop: Calcite, Amber, Axinite
Union County FAQ
Where can I rockhound in Union County, New Jersey?+
RockHoundR tracks 1 rockhounding spot in Union County. Each entry below has coordinates, mineral notes, and access type. Always confirm local rules before collecting.
What rocks and minerals are common in Union County?+
Spots in Union County most often produce Agate, Amethyst, Prehnite. Individual spots can vary widely.
Are these Union County rockhounding spots on public land?+
Most spots in this list are tagged public, but access can change with seasons, claims, and local closures. Always verify before driving out — links in the app open the right BLM, USFS, or county pages.
Plan a Union County rockhounding trip
Open RockHoundR to see these spots on the map alongside land overlays, weather, geology, and your saved finds.
