The beaches at Grand Marais are excellent hunting grounds for the ancient Lake Superior agate, a semi-precious stone made up of concentric circles of microcrystaline quartz reddened by iron. Here’s ...

No one makes eye contact. They're too intent on the ground, searching for one of Central Minnesota's oldest buried treasures: Lake Superior agates. Butch Goldenstein figures he's found hundreds of ...

With the gales of November rolling in, anyone ready to bundle up in raincoats and waterproof boots may have luck spotting Lake Superior agates and other cool rocks. Late-fall weather already whipped ...

Agates are another lower Yellowstone River attraction. Millions of years ago, volcanoes ruled Montana east of the mountains. Powerful eruptions of molten lava and ash covered and destroyed hundreds of ...