Perry: Analcime & Calcite Rockhounding in Washington County, Maine

Plan your visit

Generally open to casual rockhounding

County

Washington County

State

Maine

Nearest road

Kingsbury Road

Postcode

04667

Coordinates

45.01653, -67.07741

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 Perry

Comfortable months (45 to 90°F highs)

Best months: April to November. Typical highs run 77°F in midsummer and 29°F in midwinter, with winter lows near 11°F.

Climate normals: NOAA 1991-2020 monthlies, ROBBINSTON station (5 mi away).

Geology at Perry

This spot sits on Perry Formation, basalt member, mapped as basalt that formed roughly 420 to 360 million years ago. Volcanic ground like this is where agate, jasper, and other chalcedony typically form, filling old gas pockets and fracture seams in the flow rock.

Mapped unit

Perry Formation, basalt member

Age

420–360 Ma (Devonian)

Rock types

basalt

Elevation

20 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.

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.

State guidance last verified: April 1, 2026

• Maine Geological Survey
• Maine Mineral & Gem Museum
• Acadia National Park rules
• Community submissions reviewed against published agency rules