Montville: Serpentine Rockhounding in Morris County, New Jersey

Updated June 2026

Montville is a mapped rockhounding spot in Morris County, New Jersey. Reported finds include serpentine. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Morris County
State: New Jersey
Nearest road: Twaits Road
Postcode: 07082
Coordinates: 40.92200, -74.35868

Geology at Montville

This spot sits on Quartz-pebble Conglomerate, mapped as conglomerate that formed roughly 200 to 175 million years ago. Sedimentary rock like this erodes unevenly, so the most productive collecting is typically along fresh cuts, badland slopes, and active drainages.

Mapped unit: Quartz-pebble Conglomerate
Age: 200–175 Ma (Early Jurassic)
Rock types: conglomerate
Elevation: 260 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 Montville

Best months: March to November. Typical highs run 85°F in midsummer and 38°F in midwinter, with winter lows near 21°F.

Climate normals: NOAA 1991-2020 monthlies, BOONTON 1 SE station (3 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 Montville

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

Serpentine Encyclopedia →

Nearby rockhounding spots

Other rockhounding spots within driving distance of Montville.

Across the state line from Montville

Montville 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.

Montville FAQ

Where is Montville?+

Montville is in Morris County, New Jersey, at 40.92200, -74.35868. Nearest road: Twaits Road.

What rocks and minerals can you find at Montville?+

Montville is reported to produce Serpentine.

Is collecting allowed at Montville?+

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 Montville?+

A rock hammer, sturdy gloves, safety glasses, and a collecting bag cover the basics here. Add a spray bottle: wet rock shows color and pattern that dry rock hides.

When is the best time to visit Montville?+

The most comfortable months at Montville are March to November.

How do I get to Montville?+

Open the directions link to navigate to 40.92200, -74.35868 in Google Maps. The nearest road is Twaits Road.

More rockhounding in New Jersey

See all 72 New Jersey spots →

Open Montville on the map

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