Turkey Mountain General Area: Diopside & Marble Rockhounding in Morris County, New Jersey

Updated June 2026

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

Quick details

Access: Public area
County: Morris County
State: New Jersey
Nearest road: Lakeshore Drive
Postcode: 07045
Coordinates: 40.93971, -74.37557

Geology at Turkey Mountain General Area

This spot sits on Potassic Feldspar Gneiss, mapped as gneiss that formed roughly 1600 to 1000 million years ago. Metamorphic rock like this weathers into resistant float, and minerals that survive transport typically concentrate in nearby drainages.

Mapped unit: Potassic Feldspar Gneiss
Age: 1600–1000 Ma (Mesoproterozoic)
Rock types: gneiss
Elevation: 490 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 Turkey Mountain General Area

Best months: March to November. Typical highs run 85°F in midsummer and 37°F in midwinter, with winter lows near 20°F.

Climate normals: NOAA 1991-2020 monthlies, BOONTON 1 SE station (3 mi away), adjusted for elevation.

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 Turkey Mountain General Area

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 Turkey Mountain General Area.

Across the state line from Turkey Mountain General Area

Turkey Mountain General Area 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.

Turkey Mountain General Area FAQ

Where is Turkey Mountain General Area?+

Turkey Mountain General Area is in Morris County, New Jersey, at 40.93971, -74.37557. Nearest road: Lakeshore Drive.

What rocks and minerals can you find at Turkey Mountain General Area?+

Turkey Mountain General Area is reported to produce Diopside, Marble, Serpentine.

Is collecting allowed at Turkey Mountain General Area?+

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 Turkey Mountain General Area?+

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 Turkey Mountain General Area?+

The most comfortable months at Turkey Mountain General Area are March to November.

How do I get to Turkey Mountain General Area?+

Open the directions link to navigate to 40.93971, -74.37557 in Google Maps. The nearest road is Lakeshore Drive.

More rockhounding in New Jersey

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Open Turkey Mountain General Area on the map

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