Where to Find Chalcedony in Minnesota

Minnesota has 5 mapped collecting spots that report chalcedony, spread across 4 counties. The largest share sits in Crow Wing County with 2 spots. 5 of the spots are on land mapped as publicly accessible.

Standout chalcedony spots in Minnesota

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

Rochester
Olmsted County
The Rochester area combines two southeastern Minnesota draws: Lake Superior agate scattered through the glacial and river gravels, and Ordovician marine fossils weathering out of the region's roughly 450-million-year-old limestone and shale.
Ely
Saint Louis County
The bedrock around Ely belongs to the Archean Ely Greenstone, some of the oldest rock in Minnesota at roughly 2.7 billion years, and its iron formations and quartz veins yield jasper, quartz, and chalcedony.

Best counties for chalcedony in Minnesota

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

Every chalcedony spot we track in Minnesota

Sorted by county. Coordinates open in Google Maps.

Spot	County	Minerals	Coordinates	Access
Arco MineSlikstone Drive	Crow Wing County	Agate Chalcedony Jasper Binghamite Manganese Iron	46.4891, -94.0019	Public
Portsmouth MinePortsmouth Campground Trail	Crow Wing County	Agate Chalcedony Jasper Binghamite Manganese Iron	46.4908, -93.9714	Public
OsseoElm Creek Boulevard	Hennepin County	Lake Superior Agate Chalcedony Jasper	45.0931, -93.4087	Public
RochesterZumbro River Trail South	Olmsted County	Lake Superior Agate Chalcedony Fossils	43.9970, -92.4930	Public
ElyDavid Dill-Taconite State Trail	Saint Louis County	Jasper Quartz Chalcedony	47.8756, -91.9145	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 Minnesota FAQ

Where can you find chalcedony in Minnesota?+

The mapped spots concentrate in Crow Wing County, Hennepin County, and Olmsted County. Every spot on this page appears on the map above with coordinates and access notes.

How many chalcedony spots are mapped in Minnesota?+

5 spots across 4 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 Minnesota?+

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. 5 of the 5 mapped spots here sit on land marked public. Always confirm current rules with the managing agency before you dig.

Where else to find chalcedony

More minerals to hunt in Minnesota

Hunt chalcedony in Minnesota 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.