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 |
Neighboring counties in New Jersey
Adjacent rockhounding counties, ranked by how close their centroids sit to Union County. A natural extension if Union County is already on your trip plan.
- Hudson County~14 mi4 spotsTop: Amethyst, Common Opal, Fire Opal
- Morris County~16 mi11 spotsTop: Pyrite, Apatite, Chalcopyrite
- Somerset County~18 mi9 spotsTop: Quartz, Agate, Prehnite
- Passaic County~20 mi5 spotsTop: Calcite, Datolite, Goethite
- Sussex County~30 mi6 spotsTop: Fluorite, Willemite, Corundum
- Monmouth County~38 mi3 spotsTop: Quartz, Amber, Fossils
Across the state line from Union County
Rockhounding counties in neighboring states within driving range. Geology rarely respects state borders — these are often the closest mapped spots you can reach without going deeper into New Jersey.
- Orange County~44 miNew York · 5 spotsTop: Bloodstone, Arsenopyrite, Blue Corundum
- Bucks County~49 miPennsylvania · 6 spotsTop: Petrified Wood, Jasper, Agate
- Monroe County~52 miPennsylvania · 3 spotsTop: Quartz, Agatized Coral, Azurite
- Western Connecticut Planning Region~62 miConnecticut · 6 spotsTop: Graphite, Quartz, Aquamarine
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.
