Best spot

Chester: Emery & Diaspore Rockhounding in Hampden County, Massachusetts

Updated July 2026

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. The ore assemblage carries corundum, magnetite, margarite, and violet-gray diaspore, an unusual suite tied to altered mafic and ultramafic rock in the Berkshire highlands. Old workings and dumps sit along a public hiking trail on Gobble Mountain, giving rare walk-in access to a classic New England mine site. Reported finds include emery, diaspore, jasper, pyrrhotite, serpentine, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Chester photos

Public image records connected to this spot or its reported material.

1 photo

Wooded hillside trail through the forest at Chester, Hampden County, Massachusetts, near the historic emery mines

Quick details

Access: Public area
County: Hampden County
State: Massachusetts
Nearest road: Hampden Street
Postcode: 01011
Coordinates: 42.27905, -72.98843

Geology at Chester

This spot sits on Rowe Schist, mapped as schist that formed roughly 540 to 470 million years ago. Metamorphic rock like this weathers into resistant float, and minerals that survive transport typically concentrate in nearby drainages.

Mapped unit: Rowe Schist
Age: 540–470 Ma (Early Cambrian to Early Ordovician)
Rock types: schist
Elevation: 700 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 Chester

Best months: March to November. Typical highs run 82°F in midsummer and 34°F in midwinter, with winter lows near 14°F.

Climate normals: NOAA 1991-2020 monthlies, WORTHINGTON station (8 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 Chester

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 Chester.

Across the state line from Chester

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

Chester FAQ

Where is Chester?+

Chester is in Hampden County, Massachusetts, at 42.27905, -72.98843. Nearest road: Hampden Street.

What rocks and minerals can you find at Chester?+

Chester is reported to produce Emery, Diaspore, Jasper, Pyrrhotite, Serpentine, Chromite.

Is collecting allowed at Chester?+

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 Chester?+

Most agate and jasper is surface float: bring a spray bottle, a pick or small shovel, and a sturdy bag. Wet stones show their banding and translucence.

When is the best time to visit Chester?+

The most comfortable months at Chester are March to November.

How do I get to Chester?+

Open the directions link to navigate to 42.27905, -72.98843 in Google Maps. The nearest road is Hampden Street.

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