North of Grand Marais the basalt gives up thomsonite, a zeolite that forms in pink, green and cream concentric eyes, cut and polished into cabochons found essentially nowhere else in America in this quality. The classic ground is a short stretch of shore that has been picked for over a century. Much of the best beach is PRIVATE and has been for generations; ask locally, buy from the North Shore lapidaries, and work the public cobble beaches for what the lake turns over each season.
Thomsonite, prehnite
See it on the map
Other places on the map within a couple of hours.
