Unidentified bright blue mineral found in century-old Michigan mine – MLive.com

An unidentified blue mineral was found in the formerly inaccessible third level of the historic Adventure Mine in Greenland, Mich. | Photo courtesy of Adventure Mine
GREENLAND, MICH. — A mystery mineral has turned up in the depths of a historic Copper Country mine.
The mineral was found in the recently recovered third subterranean level of the Adventure Mine, a turn-of-the-last-century western Upper Peninsula copper mine that now hosts seasonal underground mine tours.
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