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 ...
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 ...
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 ...
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