Goethite, Pyrite, Dolomite
Becker and Tuckwood Griswold Quarry, Grant County, Wisconsin, USA
An exceptional pseudomorph of silvery-black goethite replacing pyrite, all on a bed of small dolomite crystals. The form of the pseudomorphed pyritohedrons, up to 7 mm, has remained incredibly sharp, and these goethites are extremely aesthetic as they sit as individuals and a cluster on the underlying dolomite. This is among the best, if not the ...
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