Beaverite-(Cu), Goethite
Bristol mine, Bristol Silver Mines Inc., Bristol and Jackrabbit Mining Districts, Lincoln County, Nevada, USA
A nearly hollow, tubular epimorph of goethite after gypsum, open at both ends. Scattered about this epimorph are greenish microcrystals beaverite-(Cu), an uncommon sulfate. This mineral is named after Beaver County, Utah, the location of the type locality.
Close-up of one end of the specimen. Field of view about 2 cm wide.
Specimen ...
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