(lively music) (upbeat rock music) - Agates were formed a billion years ago when Minnesota was under a lot of volcanoes, all the way up to Lake Superior down to Mille Lacs, and then they were ...

Hunting for Lake Superior agates along the St. Croix River. Eric Benson has been hunting for Lake Superior agates along the St. Croix River for the past seven years. The avid angler searches for ...

There’s treasure in Washington’s mountains, beaches and creeks. It comes in the form of crystals and agates, fossils and petrified wood. The state is rock hounding paradise, say those who pursue the ...