Where to Find Lake Superior Agate in Minnesota

The Lake Superior agate is Minnesota's state gemstone, and the best collecting follows the gravel pits, river bars, and glacial moraines south and west of Duluth. The North Shore beaches from Two Harbors to Grand Marais yield small, water-worn agates with red-brown and gray fortification banding, and the gravel pits around Carlton and Pine counties produce larger nodules from the original Keweenawan basalt source rock. Farther south, agate turns up in farm field gravels through Mille Lacs and Aitkin counties, carried there by the Superior lobe of the Wisconsin glaciation. Red, orange, and tube agates are typical; eye and ruin patterns are rarer prizes. The most productive ground is in North Shore gravel beaches (Lake County), Moose Lake area pits (Carlton County), Aitkin County glacial gravel.

Casual hand collection of common rocks and minerals like lake superior agate is allowed on most BLM and U.S. Forest Service land in Minnesota, with daily and annual limits set by the local field office. National parks, most state parks, and tribal land are off-limits. Always confirm rules before a trip.

North Shore gravel beaches (Lake County) is the standout. Other strong ground includes Moose Lake area pits (Carlton County), Aitkin County glacial gravel.