Where to Find Chalcedony in Michigan

Michigan has 5 mapped collecting spots that report chalcedony, spread across 5 counties. The largest share sits in Houghton County with 1 spot. 3 of the spots are on land mapped as publicly accessible, and 1 is a fee-dig site.

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

Standout chalcedony spots in Michigan

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

Keweenaw Point
Keweenaw County
The exposed Lake Shore Traps along the wave-washed tip of the Keweenaw Peninsula carry agate-filled amygdules and datolite, with larger Keweenaw agates working loose from a narrow gravel band at the waterline.
Lake Superior Beach (Ontonagon)
Ontonagon County
The Lake Superior shoreline around Ontonagon is among the most agate-rich in Michigan, with the stretch toward Copper Harbor noted for unusually heavy agate cover along with quartz, jasper, and occasional copper.

Best counties for chalcedony in Michigan

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

Every chalcedony spot we track in Michigan

Sorted by county. Coordinates open in Google Maps.

Spot	County	Minerals	Coordinates	Access
McClain State ParkBear Lake Road	Houghton County	Adularia Chalcedony Chert Jasper Keweenaw Agate Thomsonite Prehnite Quartz +3 more	47.2368, -88.6147	Permission
Keweenaw Point	Keweenaw County	Keweenaw Agate Thomsonite Datolite Chalcedony Jasper	47.4079, -87.7115	Public
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
Michigamme MineUS 41;M 28	Marquette County	Chalcedony Hematite Jaspilite	46.5386, -88.0972	Public
Lake Superior Beach (Ontonagon)Lakeshore Road	Ontonagon County	Keweenaw Agate Thomsonite Chalcedony Jasper	46.8713, -89.3352	Public

Before you go

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

Chalcedony in Michigan FAQ

Where can you find chalcedony in Michigan?+

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

How many chalcedony spots are mapped in Michigan?+

5 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 chalcedony 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. 3 of the 5 mapped spots here sit on land marked public, and 1 is a fee-dig operation where you pay for access and keep what you find. Always confirm current rules with the managing agency before you dig.

Where else to find chalcedony

More minerals to hunt in Michigan

Hunt chalcedony 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.