Rockhounding in Lower Connecticut River Valley Planning Region, Connecticut
13 mapped rockhounding spots in Lower Connecticut River Valley Planning Region. Most commonly produces beryl, aquamarine, garnet, smoky quartz.
Lower Connecticut River Valley Planning Region rockhounding photos
Representative spot and material photos from this county, shown where verified public image records are available.
Map showing 13 rockhounding spots in Lower Connecticut River Valley Planning Region, Connecticut
Minerals reported in Lower Connecticut River Valley Planning Region
Standouts in Lower Connecticut River Valley Planning Region
Hand-picked spots in Lower Connecticut River Valley Planning Region, chosen for unusual mineralogy or documented public access. Each card opens the full coordinates and access notes.
Top pickPlum Bank Beach
PublicLower Connecticut River Valley Planning Region
Plum Bank Beach is one of Connecticut's more reliable shoreline spots for surface agate and moonstone, tumbled from glacial outwash and concentrated in the beach gravel by Long Island Sound tides. The Laurentide ice sheet left the material as lag deposits, so the best picking follows low tide and storms rather than any bedrock exposure. It is casual beachcombing, not digging: finds run from pea to walnut sized chalcedony and adularescent feldspar.
Agate, Moonstone
Top pickCase Quarries
PublicLower Connecticut River Valley Planning Region
The Case Quarries are one of only three sites in Connecticut where mineral collecting on state land is legally sanctioned, set in the pegmatites of Meshomasic State Forest. The dumps and pegmatite have produced blue and green gem beryl, some crystals reaching 15 cm, along with columbite, monazite, muscovite, smoky quartz, and garnet. Worked for feldspar in the 1930s, the site is now managed by CT DEEP for permitted educational collecting.
Beryl, Aquamarine, Columbite, Feldspar
Top pickClark Hill Quarries
PublicLower Connecticut River Valley Planning Region
Clark Hill in Meshomasic State Forest is a second DEEP-sanctioned collecting site and includes the well-known Nathan Hall Quarry. Its pegmatites carry sharp books of muscovite, large almandine garnet, beryl in colors from yellow through aqua, and the uranium micas autunite and torbernite, along with fluorapatite and pocket microcline. It is one of the few places in Connecticut where the classic New England pegmatite suite can be collected legally.
Beryl, Aquamarine, Garnet, Muscovite
Top pickCCC Quarry
PublicLower Connecticut River Valley Planning Region
The CCC Quarry, a 19th-century feldspar working near the old Civilian Conservation Corps camp in Cockaponset State Forest, is the third state-sanctioned collecting site in Connecticut. Its pegmatite carries microcline, albite, muscovite, schorl, and beryl including aquamarine, with historic reports of uraninite and autunite. It rounds out the DEEP trio that keeps legal pegmatite collecting alive in the state.
Beryl, Aquamarine, Microcline, Albite
Spots in Lower Connecticut River Valley Planning Region
| Spot | Minerals | Coordinates | Access |
|---|---|---|---|
| Case Quarries | 41.6350, -72.6150 | Public | |
| CCC QuarryFilley Road | 41.4700, -72.5100 | Public | |
| Clark Hill QuarriesWoodcutters Road |
| 41.5937, -72.5432 | Public |
| Collins HillRose Hill Road |
| 41.5883, -72.5916 | Public |
| Gillette QuarryInjun Hollow Road | 41.4926, -72.5112 | Public | |
| Hale’s Brook QuarriesIsinglass Hill Road |
| 41.6332, -72.5784 | Public |
| MiddletownMiddlesex Avenue | 41.5784, -72.6404 | Public | |
| Pelton’s QuarryCox Road |
| 41.6011, -72.5767 | Public |
| Plum Bank BeachPlum Bank Road | 41.2648, -72.3900 | Public | |
| Riverside QuarryRiver Road | 41.5578, -72.6033 | Public | |
| Slocum ProspectStockburger Road | 41.5322, -72.4711 | Public | |
| Walden Gem QuarryWest Cotton Hill Road |
| 41.6189, -72.5961 | Public |
| White Rocks QuarryBow Lane | 41.5539, -72.6003 | Public |
Neighboring counties in Connecticut
Adjacent rockhounding counties, ranked by how close their centroids sit to Lower Connecticut River Valley Planning Region. A natural extension if Lower Connecticut River Valley Planning Region is already on your trip plan.
- Capitol Planning Region~19 mi9 spotsTop: Prehnite, Rose Quartz, Staurolite
- South Central Connecticut Planning Region~19 mi9 spotsTop: Amethyst, Calcite, Quartz
- Southeastern Connecticut Planning Region~22 mi3 spotsTop: Apatite, Corundum, Iron Ore
- Northwest Hills Planning Region~37 mi7 spotsTop: Galena, Pyrite, Sphalerite
- Western Connecticut Planning Region~50 mi6 spotsTop: Graphite, Quartz, Aquamarine
Across the state line from Lower Connecticut River Valley Planning Region
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 Connecticut.
- Hampden County~47 miMassachusetts · 4 spotsTop: Amethyst, Beryl, Chromite
- Providence County~59 miRhode Island · 8 spotsTop: Quartz, Agate, Jasper
- Hampshire County~59 miMassachusetts · 12 spotsTop: Beryl, Rhodonite, Smoky Quartz
- Berkshire County~68 miMassachusetts · 3 spotsTop: Asbestos, Green Quartz, Smoky Quartz
Lower Connecticut River Valley Planning Region FAQ
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