🪨 Thomsonite
Zeolite mineral forming colorful orbicular patterns. Minnesota's Lake Superior shoreline is famous for thomsonite nodules found on beaches.
Best Places to Find Thomsonite
Thomsonite Beach
Grand Marais, Minnesota · Public Land
Beachcombing for thomsonite — a zeolite mineral found in beach pebbles. Unique to Lake Superior's north shore.
Jay Cooke State Park
Carlton, Minnesota · State Park
Located along the St. Louis River near Lake Superior. Known for agates, thomsonite, and other Lake Superior gemstones in river gravels and outcrops.