Where to Find Rhyolite in Michigan

Michigan has 7 mapped collecting spots that report rhyolite, spread across 5 counties. The largest share sits in Luce County with 3 spots. 4 of the spots are on land mapped as publicly accessible, and 2 are fee-dig sites.

Spot list checked against source data on April 1, 2026.

Standout rhyolite spots in Michigan

Hand-picked from the full list below, with the reason each one earns a trip.

Woodland Park Beach, Grand Marais
Alger County
Grand Marais is the most famous place in Michigan to hunt Yooperlites, sodalite-bearing syenite stones that glow bright orange under ultraviolet light.

Best counties for rhyolite in Michigan

Ranked by the number of mapped rhyolite spots. County links open the full rockhounding page for that county.

Every rhyolite spot we track in Michigan

Sorted by county. Coordinates open in Google Maps.

Spot	County	Minerals	Coordinates	Access
Woodland Park Beach, Grand Marais	Alger County	Yooperlite Lake Superior Agate Jasper Quartz Granite Banded Iron Formation Gneiss Rhyolite +1 more	46.6733, -85.9911	Public
McClain State ParkBear Lake Road	Houghton County	Adularia Chalcedony Chert Jasper Keweenaw Agate Thomsonite Prehnite Quartz +3 more	47.2368, -88.6147	Permission
Gratiot River County Park	Keweenaw County	Freda Sandstone Basalt Rhyolite Unakite Granite Lake Superior Agate Prehnite Mesolite	47.3437, -88.4525	Public
Crisp Point Lighthouse	Luce County	Granite Quartz Chert Omar Gneiss Jasper Unakite Rhyolite +4 more	46.7529, -85.2574	Public
Muskallonge Lake State Park	Luce County	Granite Chert Omar Unakite Quartz Gneiss Rhyolite Basalt +2 more	46.6766, -85.6281	Paid / fee
Two Hearted River State Forest Campground	Luce County	Unakite Epidote Chert Gneiss Granite Jacobsville Sandstone Quartz Chalcedony +11 more	46.6981, -85.4226	Paid / fee
Green Park	Ontonagon County	Charlevoix Stone Honeycomb Coral Rhyolite Quartz Lake Superior Agate Yooperlite	46.8390, -89.4360	Public

Before you go

Read the rhyolite identification guide so you know what a keeper looks like in the field: Rhyolite in the encyclopedia.

Rhyolite in Michigan FAQ

Where can you find rhyolite in Michigan?+

The mapped spots concentrate in Luce County, Alger County, and Houghton County. Every spot on this page appears on the map above with coordinates and access notes.

How many rhyolite spots are mapped in Michigan?+

7 spots across 5 counties. The RockHoundR app keeps the same spots on an offline map with public land overlays, geology layers, and your saved finds.

Is it legal to collect rhyolite in Michigan?+

Hand collecting of common rocks and minerals in small amounts for personal use is generally allowed on BLM and U.S. Forest Service land, with limits set by the local field office. National parks, most state parks, and tribal land are closed to collecting. 4 of the 7 mapped spots here sit on land marked public, and 2 are fee-dig operations where you pay for access and keep what you find. Always confirm current rules with the managing agency before you dig.

More minerals to hunt in Michigan

Hunt rhyolite in Michigan with the map in your pocket

RockHoundR puts these spots on an offline map with BLM and Forest Service overlays, geology layers, and a log for your finds.