GOLDEN VALLEY, Minn. - Minnesota's state gemstone is the Lake Superior agate, and for years it has fascinated those young and old. In response to a viewer question from our kiosk at the Science Museum ...
The geochemistry of agate and chalcedony in volcanic rocks represents an intricate record of silica precipitation and crystallisation processes occurring under variable thermal and chemical conditions ...
On the west side of the Pryor Mountains, a few miles shy of the Wyoming line, a canyon's limestone walls tower above the desert rangeland. Twisted junipers, but little else, rise from the desolate ...
MOOSE LAKE, Minn. — Fall is hunting season in Minnesota, but folks walking near the Moose Lake Airport aren't looking for pheasants or deer — they're hunting for a gemstone. "There's a pretty nice one ...
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