Prospect Park Quarry: Banded Agate & Amethyst Rockhounding in Passaic County, New Jersey

Updated June 2026

Prospect Park Quarry is a mapped rockhounding spot in Passaic County, New Jersey. Reported finds include banded agate, amethyst, barite, calcite, chalcedony, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Passaic County
State: New Jersey
Nearest road: North 16th Street
Postcode: 07508
Coordinates: 40.94039, -74.17482

Geology at Prospect Park Quarry

This spot sits on Orange Mountain Basalt, mapped as basalt that formed roughly 200 to 175 million years ago. Volcanic ground like this is where agate, jasper, and other chalcedony typically form, filling old gas pockets and fracture seams in the flow rock.

Mapped unit: Orange Mountain Basalt
Age: 200–175 Ma (Early Jurassic)
Rock types: basalt
Elevation: 180 ft

Geologic mapping via Macrostrat and the underlying state geological survey maps (CC BY 4.0). Bedrock at the surface can vary within a mapped unit.

Best time to visit Prospect Park Quarry

Best months: March to November. Typical highs run 86°F in midsummer and 39°F in midwinter, with winter lows near 22°F.

Climate normals: NOAA 1991-2020 monthlies, LITTLE FALLS station (5 mi away).

Land & collecting status

Generally open to casual rockhounding

Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig.

Public-land rules vary by agency, season, and field office. The RockHoundR app pulls live BLM, USFS, NPS, and tribal overlays so you can see exactly which agency manages the ground at this spot.

Sources & verification

Spot details combine the public RockHoundR location dataset, normalized mineral labels, agency land-status checks in the app, and community submissions. Coordinates are approximate until verified in the field.

Sources: RockHoundR public spot dataset, app land overlays, and local agency review before each trip.

Found at Prospect Park Quarry

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

Nearby rockhounding spots

Other rockhounding spots within driving distance of Prospect Park Quarry.

Across the state line from Prospect Park Quarry

Prospect Park Quarry is close enough to the New Jersey border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Prospect Park Quarry FAQ

Where is Prospect Park Quarry?+

Prospect Park Quarry is in Passaic County, New Jersey, at 40.94039, -74.17482. Nearest road: North 16th Street.

What rocks and minerals can you find at Prospect Park Quarry?+

Prospect Park Quarry is reported to produce Banded Agate, Amethyst, Barite, Calcite, Chalcedony, Cuprite, Datolite, Dolomite, Galena, Goethite, Hematite, Opal, Prehnite, Quartz, Silver.

Is collecting allowed at Prospect Park Quarry?+

Generally open to casual rockhounding. Most public-tagged spots sit on BLM, U.S. Forest Service, or other federal land where reasonable hand collecting of common rocks and minerals is allowed. Confirm posted rules and active mining claims before you dig. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Prospect Park Quarry?+

Most agate and jasper is surface float: bring a spray bottle, a pick or small shovel, and a sturdy bag. Wet stones show their banding and translucence.

When is the best time to visit Prospect Park Quarry?+

The most comfortable months at Prospect Park Quarry are March to November.

How do I get to Prospect Park Quarry?+

Open the directions link to navigate to 40.94039, -74.17482 in Google Maps. The nearest road is North 16th Street.

More rockhounding in New Jersey

See all 72 New Jersey spots →

Open Prospect Park Quarry on the map

Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.