Updated July 2026
45 mapped spots across 11 counties. Massachusetts produces a wide range of rockhounding-grade material: see the full list of spots, minerals, and access notes below.
The best rockhounding in Massachusetts is at Sandwich in Barnstable County (jasper), Marshfield in Plymouth County (jasper), and Rockport in Essex County (amazonite). In total, 45 mapped collecting spots across 11 counties produce beryl, jasper, and chalcopyrite, each listed below with coordinates and land access notes.
Representative spot and material photos from locations in this state, shown where verified public image records are available.
Map showing 45 rockhounding spots in Massachusetts
Counts reflect how many spots in this list mention each mineral.
Day-trip range. Each section lists the closest mapped rockhounding spots within about 150 miles of the city — most are inside a 2 to 3 hour drive.
6 closest spots to Boston, MA.
Geology rarely respects state borders. These states share mapped rockhounding country with Massachusetts — useful when Massachusetts is the start, not the whole trip. Each card links to the closest county across the line.
County pages are linked once we have at least 3 mapped spots for a focused guide with coordinates, mineral notes, and nearby spots.
Hand-picked standouts from the Massachusetts list, chosen for unusual mineralogy, documented public access, or both. Each card links to coordinates, access notes, and what to look for.
Top pickBarnstable County
The Cape Cod Bay beaches at Sandwich sit at the southern end of the Massachusetts Bay jasper belt, where glacial outwash gravels deliver red and yellow jasper, often veined with green epidote.
Jasper
Top pickPlymouth 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
Top pickEssex County
Rockport sits on the Cape Ann granite, a coarse pluton whose miarolitic pockets and pegmatites carry blue-green amazonite (microcline), smoky quartz, and the sodium amphibole riebeckite.
Amazonite
Top pickFranklin County
The lower Deerfield River is the best known site in Massachusetts for agate, jasper, and chalcedony, eroded from the Deerfield basalt and other Triassic-Jurassic volcanic rocks of the Connecticut Valley rift and concentrated in the river's gravel bars.
Jasper, Agate, Chalcedony
Top pickHampden County
The Chester emery mines worked one of the few commercial emery deposits (corundum with magnetite) in the United States, mined from the 1860s for abrasives.
Emery, Diaspore, Jasper, Pyrrhotite
Top pickNorfolk County
Cohasset's rugged shoreline is one of the classic South Shore localities for jasper and epidote, weathered from the volcanic and intrusive rocks of the Boston-area terrane and rolled smooth in the beach gravels.
Jasper, Epidote
Top pickEssex County
Nahant's rocky shore exposes the Nahant gabbro and diabase, a dark intrusive rock cut by veins and vesicles that carry jasper, epidote, prehnite, datolite, and chalcedony, documented here since the nineteenth century.
Jasper, Epidote, Prehnite, Datolite
Top pickEssex County
Gloucester sits on the same Cape Ann granite as neighboring Rockport, and its miarolitic pockets and pegmatites yield blue-green amazonite (microcline), smoky quartz, and well-formed feldspar.
Amazonite, Smoky Quartz, Microcline
Sorted by county. Tap coordinates to open in Google Maps, or open RockHoundR for the full map view with land overlays and weather.
Open the RockHoundR app to see Massachusetts on a real map with public land overlays, weather, geology, and your saved finds.
