Rockhounding in Plymouth County, Massachusetts

2 mapped rockhounding spots in Plymouth County. Most commonly produces agate, chalcedony, jasper.

Plymouth County rockhounding photos

Representative spot and material photos from this county, shown where verified public image records are available.

1 photo

Cobble and sand beach at sunset along the Marshfield shoreline near Fourth Cliff, Plymouth County, Massachusetts — MarshfieldPlymouth County, Massachusetts

Minerals reported in Plymouth County

Standout in Plymouth County

Hand-picked spot in Plymouth County, chosen for unusual mineralogy or documented public access. Each card opens the full coordinates and access notes.

Top pick
Marshfield
Public
Plymouth County
Marshfield's beaches lie along the Massachusetts Bay jasper belt, where glacial gravels shed red and yellow jasper, epidote, and iron-rich feldspars onto the shore.
Jasper

Spots in Plymouth County

Spot	Minerals	Coordinates	Access
MarshfieldPorter Street	Jasper	42.1141, -70.6695	Public
MiddlesboroughWalnut Street	Agate Chalcedony	41.8503, -70.8904	Public

Neighboring counties in Massachusetts

Adjacent rockhounding counties, ranked by how close their centroids sit to Plymouth County. A natural extension if Plymouth County is already on your trip plan.

Across the state line from Plymouth County

Rockhounding counties in neighboring states within driving range. Geology rarely respects state borders — these are often the closest mapped spots you can reach without going deeper into Massachusetts.

Plymouth County FAQ

Where can I rockhound in Plymouth County, Massachusetts?+

RockHoundR tracks 2 rockhounding spots in Plymouth County. Each entry below has coordinates, mineral notes, and access type. Always confirm local rules before collecting.

What rocks and minerals are common in Plymouth County?+

Spots in Plymouth County most often produce Agate, Chalcedony, Jasper. Individual spots can vary widely.

Are these Plymouth County rockhounding spots on public land?+

Most spots in this list are tagged public, but access can change with seasons, claims, and local closures. Always verify before driving out — links in the app open the right BLM, USFS, or county pages.

Plan a Plymouth County rockhounding trip

Open RockHoundR to see these spots on the map alongside land overlays, weather, geology, and your saved finds.