Macungie: Blue Corundum & Sapphire Rockhounding in Lehigh County, Pennsylvania

Updated June 2026

Macungie is a mapped rockhounding spot in Lehigh County, Pennsylvania. Reported finds include blue corundum, sapphire. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Lehigh County
State: Pennsylvania
Nearest road: Beck Road
Postcode: 18049
Coordinates: 40.50307, -75.52545

Geology at Macungie

This spot sits on Hornblende gneiss, mapped as hornblende gneiss that formed roughly 4600 to 540 million years ago. Metamorphic rock like this is where garnet, staurolite, and kyanite typically grow as the rock recrystallizes under heat and pressure.

Mapped unit: Hornblende gneiss
Age: 4600–540 Ma (Precambrian)
Rock types: hornblende gneiss
Elevation: 720 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 Macungie

Best months: March to November. Typical highs run 84°F in midsummer and 37°F in midwinter, with winter lows near 19°F.

Climate normals: NOAA 1991-2020 monthlies, RODALE RSCH CTR station (11 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 Macungie

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 Macungie.

Across the state line from Macungie

Macungie is close enough to the Pennsylvania border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.

Macungie FAQ

Where is Macungie?+

Macungie is in Lehigh County, Pennsylvania, at 40.50307, -75.52545. Nearest road: Beck Road.

What rocks and minerals can you find at Macungie?+

Macungie is reported to produce Blue Corundum, Sapphire.

Is collecting allowed at Macungie?+

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 Macungie?+

A rock hammer, a sieve, and a small shovel work well for garnet-type minerals, which concentrate as resistant grains in soils and creek gravels.

When is the best time to visit Macungie?+

The most comfortable months at Macungie are March to November.

How do I get to Macungie?+

Open the directions link to navigate to 40.50307, -75.52545 in Google Maps. The nearest road is Beck Road.

More rockhounding in Pennsylvania

See all 88 Pennsylvania spots →

Open Macungie on the map

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