Minnesota's Lake Superior hides a volcanic past, where ancient eruptions left stunning agates that sparkle with history.

GRAND MARAIS, Minn. — Among the many pastimes popular in Minnesota is agate hunting -- scanning the shores of Lake Superior for the official state gemstone. Relatively easy to find in the summer when ...

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 ...

Harley Alcala says he found the mother lode of Lake Superior agates right in Lake Superior. Alcala was kayaking near his home in Hovland on the North Shore when he spotted the basketball-size rock ...

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 ...

A Duluth store known for paying cash for agates is closing Friday. Fragments of History owner Terry Roses of Duluth is retiring after 12 years of trading agates, rare coins, gold, and silver. (Photo ...