Crum Creek: Golden Beryl & Amethyst Rockhounding in Delaware County, Pennsylvania

Plan your visit

Generally open to casual rockhounding

County

Delaware County

State

Pennsylvania

Nearest road

Parkridge Drive

Postcode

19063

Coordinates

39.92273, -75.36417

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.

Access note: Collect from public creek banks and gravel bars; do not trespass on adjacent private property or disturb streambeds beyond loose surface material. Wear sturdy footwear and mind water levels after rain.

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 Crum Creek

Comfortable months (45 to 90°F highs)

Best months: February to December. Typical highs run 88°F in midsummer and 43°F in midwinter, with winter lows near 26°F.

Climate normals: NOAA 1991-2020 monthlies, MARCUS HOOK station (8 mi away).

Geology at Crum Creek

This spot sits on Wissahickon Formation, mapped as mica schist that formed roughly 540 to 250 million years ago. Metamorphic terrain like this typically carries quartz veins and sweats, and weathered crystals tend to end up in the soils and streams below.

Mapped unit

Wissahickon Formation

Age

540–250 Ma (Paleozoic)

Rock types

mica schist

Elevation

110 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