East Branch Naamanm Creek: Sphene & Quartz Rockhounding in Delaware County, Pennsylvania

Plan your visit

Generally open to casual rockhounding

County

Delaware County

State

Pennsylvania

Nearest road

Broomall Street

Postcode

19061

Coordinates

39.82522, -75.44562

Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.

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.

Best time to visit East Branch Naamanm Creek

Comfortable months (45 to 90°F highs)

Best months: February to December. Typical highs run 89°F in midsummer and 43°F in midwinter, with winter lows near 27°F.

Climate normals: NOAA 1991-2020 monthlies, MARCUS HOOK station (1 mi away).

Geology at East Branch Naamanm Creek

This spot sits on Anorthosite, mapped as anorthosite that formed roughly 540 to 250 million years ago. Granitic ground like this typically carries quartz veins and pockets, and weathered crystals tend to collect in the soils and drainages below.

Mapped unit

Anorthosite

Age

540–250 Ma (Paleozoic)

Rock types

anorthosite

Elevation

90 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.

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.

• Pennsylvania Geological Survey
• DCNR state park and state forest rules
• Allegheny National Forest
• Community submissions reviewed against published agency rules