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 ...
DULUTH — About 1.1 billion years ago here, fissures opened in the surface of the earth, depositing lakes of molten rock near what would eventually be the Twin Ports and Lake Superior. This is ...
For the past 20 years, Jesse Lofgren has slowly amassed a collection of Lake Superior agates. But when he returned from a monthlong business trip earlier this week, Lofgren discovered that $60,000 ...
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