Norwich: Corundum & Sillimanite Rockhounding in Southeastern Connecticut Planning Region, Connecticut

Updated June 2026

Norwich is a mapped rockhounding spot in Southeastern Connecticut Planning Region, Connecticut. Reported finds include corundum, sillimanite. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Public area
County: Southeastern Connecticut Planning Region
State: Connecticut
Nearest road: Mohegan Park Road
Postcode: 06360
Coordinates: 41.54683, -72.06790

Geology at Norwich

This spot sits on Tatnic Hill Formation, mapped as gneiss and schist that formed roughly 1000 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: Tatnic Hill Formation
Age: 1000–540 Ma (Neoproterozoic)
Rock types: gneiss and schist
Elevation: 260 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 Norwich

Best months: March to November. Typical highs run 83°F in midsummer and 37°F in midwinter, with winter lows near 20°F.

Climate normals: NOAA 1991-2020 monthlies, NORWICH PUBLIC UTILITY PLT station (1 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 Norwich

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 Norwich.

Across the state line from Norwich

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

Norwich FAQ

Where is Norwich?+

Norwich is in Southeastern Connecticut Planning Region, Connecticut, at 41.54683, -72.06790. Nearest road: Mohegan Park Road.

What rocks and minerals can you find at Norwich?+

Norwich is reported to produce Corundum, Sillimanite.

Is collecting allowed at Norwich?+

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 Norwich?+

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 Norwich?+

The most comfortable months at Norwich are March to November.

How do I get to Norwich?+

Open the directions link to navigate to 41.54683, -72.06790 in Google Maps. The nearest road is Mohegan Park Road.

More rockhounding in Connecticut

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Open Norwich on the map

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