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 ...
From the Leland Blue, a stone-like slag leftover from the iron ore and mining industry, to the glowing Yooperlite and Lake Superior agates found in the Upper Peninsula, Michigan is home to plenty of ...
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