Muskallonge Lake State Park: Granite & Chert Rockhounding in Luce County, Michigan

Updated August 2026

Muskallonge Lake State Park is a mapped rockhounding spot in Luce County, Michigan. Reported finds include granite, chert, omar, unakite, quartz, and more. Below: coordinates, access notes, nearby spots, and trip-planning links.

Quick details

Access: Paid / fee dig
County: Luce County
State: Michigan
Coordinates: 46.67661, -85.62808

Geology at Muskallonge Lake State Park

This spot sits on Jacobsville Sandstone, mapped as sandstone that formed roughly 1600 to 1000 million years ago. Tough silica like agate, jasper, and chert typically weathers out of beds like these and collects as float in drainages and on deflation surfaces.

Mapped unit: Jacobsville Sandstone
Age: 1600–1000 Ma (Mesoproterozoic)
Rock types: sandstone
Elevation: 630 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 Muskallonge Lake State Park

Best months: April to October. Typical highs run 74°F in midsummer and 24°F in midwinter, with winter lows near 14°F.

Climate normals: NOAA 1991-2020 monthlies, GRAND MARAIS 2 E station (15 mi away).

Land & collecting status

Pay-to-dig site

This is a fee-dig location. Hours, prices, and what you can keep vary by operator. Call ahead before driving out.

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

Michigan DNR — Rockhounding rules
Michigan Geological Survey
Isle Royale National Park — Rules
Community submissions reviewed against published agency rules

Found at Muskallonge Lake State Park

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 Muskallonge Lake State Park.

Muskallonge Lake State Park FAQ

Where is Muskallonge Lake State Park?+

Muskallonge Lake State Park is in Luce County, Michigan, at 46.67661, -85.62808.

What rocks and minerals can you find at Muskallonge Lake State Park?+

Muskallonge Lake State Park is reported to produce Granite, Chert, Omar, Unakite, Quartz, Gneiss, Rhyolite, Basalt, Lake Superior Agate, Yooperlite.

Is collecting allowed at Muskallonge Lake State Park?+

Pay-to-dig site. This is a fee-dig location. Hours, prices, and what you can keep vary by operator. Call ahead before driving out. Always confirm current rules with the managing agency before a trip.

What tools should I bring to Muskallonge Lake State Park?+

Most agate and jasper is surface float: bring a spray bottle, a pick or small shovel, and a sturdy bag. Wet stones show their banding and translucence.

When is the best time to visit Muskallonge Lake State Park?+

The most comfortable months at Muskallonge Lake State Park are April to October.

How do I get to Muskallonge Lake State Park?+

Open the directions link to navigate to 46.67661, -85.62808 in Google Maps. Some spots are remote, so check road conditions before driving out.

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Open Muskallonge Lake State Park on the map

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