Blue Hill: Albite & Amazonite Rockhounding in Delaware County, Pennsylvania

Plan your visit

Permission required before collecting

County

Delaware County

State

Pennsylvania

Nearest road

Sycamore Mills Road

Postcode

19063

Coordinates

39.94669, -75.42360

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

Land & collecting status

Permission required before collecting

Requires landowner or agency permission before any collecting. Do not enter without explicit authorization.

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 Blue Hill

Comfortable months (45 to 90°F highs)

Best months: February to December. Typical highs run 88°F in midsummer and 42°F in midwinter, with winter lows near 26°F.

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

Geology at Blue Hill

This spot sits on Felsic and intermediate gneiss, mapped as gneiss that formed roughly 4600 to 540 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

Felsic and intermediate gneiss

Age

4600–540 Ma (Precambrian)

Rock types

gneiss

Elevation

190 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