Ragged Jack Mountain: Almandine Garnet & Chrysoberyl Rockhounding in Oxford County, Maine

Quick details

Access

Public area

County

Oxford County

State

Maine

Nearest road

Andrews Drive

Postcode

04220

Coordinates

44.42233, -70.40923

Geology at Ragged Jack Mountain

This spot sits on Seboomook Formation Day Mountain member, mapped as metasandstone, pelitic schist, and metasiltstone that formed roughly 420 to 395 million years ago. Metamorphic terrain like this typically carries quartz veins and sweats, and weathered crystals tend to end up in the soils and streams below.

Mapped unit

Seboomook Formation Day Mountain member

Age

420–395 Ma (Early Devonian)

Rock types

metasandstone, pelitic schist, and metasiltstone

Elevation

860 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 Ragged Jack Mountain

Best months: April to October. Typical highs run 77°F in midsummer and 26°F in midwinter, with winter lows near 8°F.

Climate normals: NOAA 1991-2020 monthlies, HARTFORD station (6 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.

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

Found at Ragged Jack Mountain

Each chip opens all spots that produce that material; the encyclopedia link opens the full ID and field guide.

• Almandine GarnetEncyclopedia →
• Chrysoberyl
• Fluorapatite
• FeldsparEncyclopedia →
• MicaEncyclopedia →
• QuartzEncyclopedia →
• Schorl