Grand Isle: Quartz & Calcite Rockhounding in Grand Isle County, Vermont
- Minerals reported
- 3
- Elevation
- 120 ft
- Best months
- April to November
Grand Isle is a mapped rockhounding spot in Grand Isle County, Vermont. Reported finds include quartz, calcite, pyrite concretion. Below: coordinates, access notes, nearby spots, and trip-planning links.
Plan your visit
Generally open to casual rockhounding
- County
- Grand Isle County
- State
- Vermont
- Nearest road
- Nautical Court
- Postcode
- 05486
- Coordinates
- 44.63220, -73.27040
Coordinates are approximate. Confirm the exact ground in the RockHoundR app, where land overlays show which agency manages the area.
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.
Best time to visit Grand Isle
Comfortable months (45 to 90°F highs)
Best months: April to November. Typical highs run 81°F in midsummer and 28°F in midwinter, with winter lows near 11°F.
Climate normals: NOAA 1991-2020 monthlies, S HERO station (2 mi away).
Geology at Grand Isle
This spot sits on Stony Point Formation, mapped as shale and limestone that formed roughly 460 to 445 million years ago. Carbonate rock like this dissolves and weathers readily, so fresh road cuts, quarries, and creek exposures are typically the most productive ground.
- Mapped unit
- Stony Point Formation
- Age
- 460–445 Ma (Late Ordovician)
- Rock types
- shale and limestone
- Elevation
- 120 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.
Today's weather
Is today a good day to go?
The app shows live weather, recent rain, and a daily rockhounding score for Grand Isle.
Get the appSources & 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.
- Vermont Geological Survey
- Green Mountain National Forest
- Vermont State Parks, Camp Plymouth
- Community submissions reviewed against published agency rules
Found at Grand Isle
Each name 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 Grand Isle.
- Lamoille RiverChittenden County, Vermont · 4 mi awayDolomite, Chalcopyrite
- Niquette BayChittenden County, Vermont · 5 mi awayAgate, Chert, Jasper
- South AlburgGrand Isle County, Vermont · 18 mi awayQuartz
- QuarryGrand Isle County, Vermont · 19 mi awayMarcasite, Fossil, Gastropod
- SwantonFranklin County, Vermont · 21 mi awayRed Marble, Dunham Dolomite
- East FletcherFranklin County, Vermont · 22 mi awayPyrite
- Lamoille RiverLamoille County, Vermont · 29 mi awayGold
- Little RiverLamoille County, Vermont · 31 mi awayGold
Across the state line from Grand Isle
Grand Isle is close enough to the Vermont border that the next-closest rockhounding spots are in a neighboring state. Worth knowing if you are already on the road.
- Port KentEssex County, New York · 10 mi awayLabradorite
- Buttermilk FallsEssex County, New York · 14 mi awaySerpentine
- KeesevilleClinton County, New York · 14 mi awayLabradorite
- Arnold HillClinton County, New York · 20 mi awayMagnetite
- Arnold Hill MineClinton County, New York · 20 mi awayJasper, Magnetite, Martite
- Palmer Hill MineClinton County, New York · 23 mi awayFluorite
Grand Isle FAQ
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More rockhounding in Vermont
See all 30 Vermont spots →
Open Grand Isle on the map
Use the RockHoundR app for live land overlays, weather, geology, directions, and saved finds.
